[FIX] sale: default company on SO

In multi-company:
- Create 2 companies A and B
- Set the superuser on company B
- Set the website on company A
- Define company specific sequences for SO (e.g. SOA and SOB)

When a SO is generated from the eCommerce, it is defined on company A
(thanks to 8a1b55a), but the sequence is from company B.

opw-744561

addons/sale/sale.py

@@ -225,7 +225,10 @@ class SaleOrder(models.Model):
     @api.model
     def create(self, vals):
         if vals.get('name', _('New')) == _('New'):
-            vals['name'] = self.env['ir.sequence'].next_by_code('sale.order') or _('New')
+            if 'company_id' in vals:
+                vals['name'] = self.env['ir.sequence'].with_context(force_company=vals['company_id']).next_by_code('sale.order') or _('New')
+            else:
+                vals['name'] = self.env['ir.sequence'].next_by_code('sale.order') or _('New')
 
         # Makes sure partner_invoice_id', 'partner_shipping_id' and 'pricelist_id' are defined
         if any(f not in vals for f in ['partner_invoice_id', 'partner_shipping_id', 'pricelist_id']):