FIX] website_sale: prevent website with no pricelist in multi company

Followup on 911ada2d

When modifying the company_id of a pricelist, the check to ensure a website
has a pricelist available wasn't triggered.

This commits ensures the Each website has Valid Pricelist with Correct or
Empty company.

Fixes #50707

closes odoo/odoo#50785

Signed-off-by: Romain Derie <rdeodoo@users.noreply.github.com>

addons/website_sale/models/product.py

@@ -89,6 +89,7 @@ class ProductPricelist(models.Model):
         - Have its `website_id` set to current website (specific pricelist).
         - Have no `website_id` set and should be `selectable` (generic pricelist)
           or should have a `code` (generic promotion).
+        - Have no `company_id` or a `company_id` matching its website one.
 
         Note: A pricelist without a website_id, not selectable and without a
               code is a backend pricelist.
@@ -96,13 +97,17 @@ class ProductPricelist(models.Model):
         Change in this method should be reflected in `_get_website_pricelists_domain`.
         """
         self.ensure_one()
+        if self.company_id and self.company_id != self.env["website"].browse(website_id).company_id:
+            return False
         return self.website_id.id == website_id or (not self.website_id and (self.selectable or self.sudo().code))
 
     def _get_website_pricelists_domain(self, website_id):
         ''' Check above `_is_available_on_website` for explanation.
         Change in this method should be reflected in `_is_available_on_website`.
         '''
+        company_id = self.env["website"].browse(website_id).company_id.id
         return [
+            '&', ('company_id', 'in', [False, company_id]),
             '|', ('website_id', '=', website_id),
             '&', ('website_id', '=', False),
             '|', ('selectable', '=', True), ('code', '!=', False),