[IMP] website_sale_delivery: set auto_install True

When e-commerce and delivery are installed, website_sale_delivery should be
installed.

addons/website_sale_delivery/__manifest__.py

@@ -19,4 +19,5 @@ Delivery Costs
     ],
     'qweb': [],
     'installable': True,
+    'auto_install': True,
 }