[FIX] website_sale: set user_id of newly created partners to the website salesperson
[FIX] website_sale: set user_id of newly created partners to the website salesperson

When an unlogger user places an order, a new partner is created on the fly when
the unlogged user is asked to place his delivery address.
The values he enters on the form are processed before being used.
In particular the team_id is taken from the order (typically website_sale team).
We add to the new values the salesperson id.
This value is then used in onchange_partner_id to update the order's user_id.

opw 1889510

closes odoo/odoo#28030
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo