[FIX] delivery: Dont add other companies taxes deliveries

When delivery_set is called from the website_delivery module, the
uid is set to SUPERUSER_ID. In a multi-company environment, this
causes the linked taxes from the delivery product to be added
to the sale_order_line.

Closes odoo#8311

addons/delivery/sale.py

@@ -77,7 +77,7 @@ def delivery_set(self, cr, uid, ids, context=None):
 
             grid = grid_obj.browse(cr, uid, grid_id, context=context)
 
-            taxes = grid.carrier_id.product_id.taxes_id
+            taxes = grid.carrier_id.product_id.taxes_id.filtered(lambda t: t.company_id.id == order.company_id.id)
             fpos = order.fiscal_position or False
             taxes_ids = acc_fp_obj.map_tax(cr, uid, fpos, taxes)
             price_unit = grid_obj.get_price(cr, uid, grid.id, order, time.strftime('%Y-%m-%d'), context)