[FIX] sale: keep Salesperson

When creating an advance from a SO, the Salesperson is not kept.

opw-752490

addons/sale/wizard/sale_make_invoice_advance.py

@@ -113,6 +113,7 @@ class SaleAdvancePaymentInv(models.TransientModel):
             'payment_term_id': order.payment_term_id.id,
             'fiscal_position_id': order.fiscal_position_id.id or order.partner_id.property_account_position_id.id,
             'team_id': order.team_id.id,
+            'user_id': order.user_id.id,
             'comment': order.note,
         })
         invoice.compute_taxes()