Update payment_group field to use the company function field

It will read the value from statement and from origin (if statement is not
set), so both could work and let the user choose a payment_group.

issue7930

statement.py

@@ -77,13 +77,13 @@ class StatementLine(metaclass=PoolMeta):
     payment_group = fields.Many2One(
         'account.payment.group', "Payment Group",
         domain=[
-            ('company', '=', Eval('_parent_statement', {}).get('company', -1)),
+            ('company', '=', Eval('company', -1)),
             ],
         states={
             'invisible': Bool(Eval('payment')) | Bool(Eval('invoice')),
             'readonly': Eval('statement_state') != 'draft',
             },
-        depends=['statement_state'])
+        depends=['company', 'statement_state'])
 
     @classmethod
     def __setup__(cls):