[FIX] website_portal_sale: SO state

Add the SO state on the payment transaction, in order to be able to spot
more easily unconfirmed SO due to incomplete payments.

opw-748467

addons/website_portal_sale/models/payment.py

@@ -11,6 +11,7 @@ class PaymentTransaction(models.Model):
 
     # link with the sale order
     sale_order_id = fields.Many2one('sale.order', string='Sale Order')
+    so_state = fields.Selection('sale.order', string='Sale Order State', related='sale_order_id.state')
 
     def _generate_and_pay_invoice(self, tx, acquirer_name):
         tx.sale_order_id._force_lines_to_invoice_policy_order()