product_harmonized_system_delivery: hs_code is now store=True

This commit is the "followup" of the change to company_dependent=False
on the fields hs_code_id on product.template and product.category.
Add groupby on hs_code_id on product.template search view
hs.code is now company_id=False by default

product_harmonized_system/models/hs_code.py

@@ -53,7 +53,7 @@ class HSCode(models.Model):
 
     @api.model
     def _default_company_id(self):
-        return self.env.company
+        return False
 
     @api.depends("local_code")
     def _compute_hs_code(self):