[FIX] account_payment_partner: test integration failure

STR:
1. Install `partner_multi_company`
2. Install `product_multi_company`
3. Install `hr_expense`
4. Install and test `account_payment_partner`

Error:

```
2023-04-05 09:12:48,641 72 ERROR odoo unittest.suite: ERROR: setUpClass (odoo.addons.account_payment_partner.tests.test_account_payment_partner.TestAccountPaymentPartner)
Traceback (most recent call last):
  File "/opt/odoo/auto/addons/account_payment_partner/tests/test_account_payment_partner.py", line 35, in setUpClass
    cls.env.user.company_id = cls.company_2.id
  File "/opt/odoo/custom/src/odoo/odoo/fields.py", line 1150, in __set__
    records.write({self.name: write_value})
  File "/opt/odoo/auto/addons/pos_blackbox_be/models/res_users.py", line 55, in write
    return super(ResUser, self).write(values)
  File "/opt/odoo/auto/addons/website_slides/models/res_users.py", line 19, in write
    res = super(Users, self).write(vals)
  File "/opt/odoo/auto/addons/helpdesk/models/res_users.py", line 45, in write
    return super().write(vals)
  File "/opt/odoo/auto/addons/hr/models/res_users.py", line 189, in write
    result = super(User, self).write(vals)
  File "/opt/odoo/auto/addons/gamification/models/res_users.py", line 63, in write
    result = super(Users, self).write(vals)
  File "/opt/odoo/auto/addons/mail/models/res_users.py", line 88, in write
    write_res = super(Users, self).write(vals)
  File "/opt/odoo/auto/addons/partner_multi_company/models/res_users.py", line 28, in write
    user.partner_id.company_ids = [(4, vals["company_id"])]
  File "/opt/odoo/custom/src/odoo/odoo/fields.py", line 1150, in __set__
    records.write({self.name: write_value})
  File "/opt/odoo/auto/addons/sale_subscription/models/res_partner.py", line 14, in write
    res = super().write(vals)
  File "/opt/odoo/auto/addons/payment_sepa_direct_debit/models/partner.py", line 18, in write
    res = super().write(vals)
  File "/opt/odoo/auto/addons/mass_mailing_partner/models/res_partner.py", line 74, in write
    res = super().write(vals)
  File "/opt/odoo/auto/addons/base_vat/models/res_partner.py", line 643, in write
    return super(ResPartner, self).write(values)
  File "/opt/odoo/auto/addons/snailmail/models/res_partner.py", line 26, in write
    return super(ResPartner, self).write(vals)
  File "/opt/odoo/auto/addons/partner_autocomplete/models/res_partner.py", line 199, in write
    res = super(ResPartner, self).write(values)
  File "/opt/odoo/auto/addons/base_multi_company/models/multi_company_abstract.py", line 74, in write
    return super().write(vals)
  File "/opt/odoo/auto/addons/partner_contact_lang/models/res_partner.py", line 13, in write
    res = super(ResPartner, self).write(vals)
  File "/opt/odoo/auto/addons/base_address_extended/models/res_partner.py", line 127, in write
    res = super(Partner, self).write(vals)
  File "/opt/odoo/custom/src/odoo/odoo/addons/base/models/res_partner.py", line 560, in write
    partner._fields_sync(vals)
  File "/opt/odoo/custom/src/odoo/odoo/addons/base/models/res_partner.py", line 479, in _fields_sync
    self._children_sync(values)
  File "/opt/odoo/custom/src/odoo/odoo/addons/base/models/res_partner.py", line 488, in _children_sync
    self._commercial_sync_to_children()
  File "/opt/odoo/custom/src/odoo/odoo/addons/base/models/res_partner.py", line 461, in _commercial_sync_to_children
    res = sync_children.write(sync_vals)
  File "/opt/odoo/auto/addons/sale_subscription/models/res_partner.py", line 14, in write
    res = super().write(vals)
  File "/opt/odoo/auto/addons/payment_sepa_direct_debit/models/partner.py", line 18, in write
    res = super().write(vals)
  File "/opt/odoo/auto/addons/mass_mailing_partner/models/res_partner.py", line 74, in write
    res = super().write(vals)
  File "/opt/odoo/auto/addons/base_vat/models/res_partner.py", line 643, in write
    return super(ResPartner, self).write(values)
  File "/opt/odoo/auto/addons/snailmail/models/res_partner.py", line 26, in write
    return super(ResPartner, self).write(vals)
  File "/opt/odoo/auto/addons/partner_autocomplete/models/res_partner.py", line 199, in write
    res = super(ResPartner, self).write(values)
  File "/opt/odoo/auto/addons/base_multi_company/models/multi_company_abstract.py", line 74, in write
    return super().write(vals)
  File "/opt/odoo/auto/addons/partner_contact_lang/models/res_partner.py", line 13, in write
    res = super(ResPartner, self).write(vals)
  File "/opt/odoo/auto/addons/base_address_extended/models/res_partner.py", line 127, in write
    res = super(Partner, self).write(vals)
  File "/opt/odoo/custom/src/odoo/odoo/addons/base/models/res_partner.py", line 556, in write
    result = result and super(Partner, self).write(vals)
  File "/opt/odoo/auto/addons/mail/models/mail_activity.py", line 788, in write
    return super(MailActivityMixin, self).write(vals)
  File "/opt/odoo/auto/addons/mail/models/mail_thread.py", line 322, in write
    result = super(MailThread, self).write(values)
  File "/opt/odoo/auto/addons/website/models/mixins.py", line 205, in write
    return super(WebsitePublishedMixin, self).write(values)
  File "/opt/odoo/custom/src/odoo/odoo/models.py", line 3730, in write
    self._check_company()
  File "/opt/odoo/custom/src/odoo/odoo/models.py", line 3335, in _check_company
    raise UserError("\n".join(lines))
odoo.exceptions.UserError: Incompatible companies on records:
- "OdooBot, Pieter Parter's Farm" belongs to company 'Company 2' and 'Supplier Payment Mode' (supplier_payment_mode_id: 'Credit Transfer to Suppliers') belongs to another company.
- "OdooBot, Pieter Parter's Farm" belongs to company 'Company 2' and 'Customer Payment Mode' (customer_payment_mode_id: 'Inbound Credit Trf Société Générale') belongs to another company.
```

With this change, the test is simpler and won't make that side effect.

@moduon MT-2638

account_payment_partner/tests/test_account_payment_partner.py

@@ -31,10 +31,7 @@ class TestAccountPaymentPartner(SavepointCase):
             cls.chart = charts[0]
         else:
             raise ValidationError(_("No Chart of Account Template has been defined !"))
-        old_company = cls.env.user.company_id
-        cls.env.user.company_id = cls.company_2.id
-        cls.chart.try_loading()
-        cls.env.user.company_id = old_company.id
+        cls.chart.with_company(cls.company_2).try_loading()
 
         # refs
         cls.manual_out = cls.env.ref("account.account_payment_method_manual_out")