[FIX] account: bank account on refund

- Create a customer invoice
- Set a bank account for payment
- Validate
- Add a credit note, choose 'Modify'

The bank account is not kept on the modified invoice.

We add the field since it makes sense to keep the information.

opw-2244527

closes odoo/odoo#50270

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/account/wizard/account_invoice_refund.py

@@ -96,6 +96,7 @@ class AccountInvoiceRefund(models.TransientModel):
                             'date': date,
                             'origin': inv.origin,
                             'fiscal_position_id': inv.fiscal_position_id.id,
+                            'partner_bank_id': inv.partner_bank_id.id,
                         })
                         for field in inv_obj._get_refund_common_fields():
                             if inv_obj._fields[field].type == 'many2one':