[FIX] website_sale: pricelist multi company

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

This commit ensures the check is done in this case, to avoid
the absence of any pricelist for a given website (which breaks /shop).

Fixes #50707

closes odoo/odoo#50760

X-original-commit: 911ada2d02b24778435fd9174441a6834da2effa
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/website_sale/models/product.py

@@ -54,7 +54,7 @@ class ProductPricelist(models.Model):
 
     def write(self, data):
         res = super(ProductPricelist, self).write(data)
-        if data.keys() & {'code', 'active', 'website_id', 'selectable'}:
+        if data.keys() & {'code', 'active', 'website_id', 'selectable', 'company_id'}:
             self._check_website_pricelist()
         self.clear_cache()
         return res