[FIX] sale: paylink does'nt work

if partner_id is diff than partner_invoice_id on sale.order.

https://github.com/odoo/odoo/blob/16.0/addons/sale/controllers/portal.py#L346

- go to runbot
- create a sale.order
- set partner_invoice_id != partner_id
- create a link
go to the link --> error

closes odoo/odoo#121905

X-original-commit: 811ed2fb763155abbaba29e8c9193166a9cc34cc
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/sale/models/sale_order.py

@@ -1467,7 +1467,7 @@ class SaleOrder(models.Model):
         return {
             'description': self.name,
             'currency_id': self.currency_id.id,
-            'partner_id': self.partner_id.id,
+            'partner_id': self.partner_invoice_id.id,
             'amount': amount,
             'amount_max': amount,
             'amount_paid': self.amount_paid,