[FIX] purchase: supplier on parent company
[FIX] purchase: supplier on parent company

- Create a product and set a contact as the vendor (for instance, Arthur
  Gomez from Asustek in the runbot)
- Set a specific name and code for the supplier
- Create a RFQ for this vendor (Arthur Gomez - the contact person)
- Add the product, confirm the RFQ

On the product, the company (Asustek) is automatically added as vendor,
but there is no vendor name and code.

opw-1929745

closes odoo/odoo#30891
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo