[FIX] payment: use standard odoo exceptions

An old hack simple overrode the standard python ValueError instead
of except_orm, which explains how it survived for so long.

addons/payment/models/payment_acquirer.py

@@ -4,6 +4,7 @@ import logging
 from odoo import api, exceptions, fields, models, _
 from odoo.tools import float_round, image_resize_images
 from odoo.addons.base.module import module
+from odoo.exceptions import ValidationError
 
 _logger = logging.getLogger(__name__)
 
@@ -16,11 +17,6 @@ def _partner_split_name(partner_name):
     return [' '.join(partner_name.split()[:-1]), ' '.join(partner_name.split()[-1:])]
 
 
-class ValidationError(ValueError):
-    """ Used for value error when validating transaction data coming from acquirers. """
-    pass
-
-
 class PaymentAcquirer(models.Model):
     """ Acquirer Model. Each specific acquirer can extend the model by adding
     its own fields, using the acquirer_name as a prefix for the new fields.