[FIX] point_of_sale : wrong api

Before this PR when you select a pos.payment in custom, it raise.
It doesn't make sens to use api.model here

closes odoo/odoo#104615

X-original-commit: 2abeb8cc5b015263ce49d765315712f92ec25c25
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>

addons/point_of_sale/models/pos_payment.py

@@ -33,7 +33,6 @@ class PosPayment(models.Model):
     is_change = fields.Boolean(string='Is this payment change?', default=False)
     account_move_id = fields.Many2one('account.move')
 
-    @api.model
     def name_get(self):
         res = []
         for payment in self: