[FIX] account: usage of self in loop of payment register compute

closes odoo/odoo#77699

X-original-commit: 7936736f208cd7483ae8b9a508cf7387cd504b83
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

addons/account/wizard/account_payment_register.py

@@ -282,7 +282,7 @@ class AccountPaymentRegister(models.TransientModel):
         # it's a compute editable field and then, should be computed in a separated method.
         for wizard in self:
             if wizard.can_edit_wizard:
-                batches = self._get_batches()
+                batches = wizard._get_batches()
                 wizard.communication = wizard._get_batch_communication(batches[0])
             else:
                 wizard.communication = False