[FIX] rma: Perform refund with proper view

Not indicating account.invoice, it takes the default that is the vendor bill view.
We force the suitable one.

rma/models/rma.py

@@ -573,7 +573,7 @@ class Rma(models.Model):
             invoice_form = Form(self.env['account.invoice'].with_context(
                 default_type='out_refund',
                 company_id=rmas[0].company_id.id,
-            ))
+            ), "account.invoice_form")
             rmas[0]._prepare_refund(invoice_form, origin)
             refund = invoice_form.save()
             for rma in rmas: