[FIX] website_sale: multi-website

- Create 2 companies A & B
- For each company, create a website linked to a specific URL
- As a public user, visit website of B
- Buy a product, register your address

The partner is in company A (the company of the superuser) instead of
company B (the company of the website).

opw-1962197

closes odoo/odoo#32822

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>