[FIX] payment: Wrong use of write method on not stored field

Steps to reproduce the issue:

- Accounting > Configuration > Journals
- Click on Journal
- View metadata of Journal

Bug:

Even if no modification has been made to the journal, it marked current time
in Latest Modification By/Date

opw:3089551

closes odoo/odoo#107816

Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/payment/models/account_journal.py

@@ -68,6 +68,4 @@ class AccountJournal(models.Model):
                 if vals['mode'] == 'unique' and not available:
                     to_remove.append(payment_method.id)
 
-                journal.write({
-                    'available_payment_method_ids': [Command.unlink(payment_method) for payment_method in to_remove]
-                })
+                journal.available_payment_method_ids = [Command.unlink(payment_method) for payment_method in to_remove]