[IMP] payment: use ondelete instead of custom error

Use generic method on_delete instead of personalized one for the sake of
clarity and reproductibility.

task-2883630

closes odoo/odoo#99958

Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

addons/payment/models/__init__.py

@@ -1,7 +1,6 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from . import ir_http
-from . import ir_ui_view
 from . import payment_provider
 from . import payment_icon
 from . import payment_token