[FIX] website_sale: default "Product Prices" value

The default value should be 'subtotal' in the website settings, since it
is already the case in the sales settings.

opw-766024

addons/website_sale/models/res_config.py

@@ -77,7 +77,7 @@ def _default_order_mail_template(self):
     sale_show_tax = fields.Selection([
         ('total', 'Tax-Included Prices'),
         ('subtotal', 'Tax-Excluded Prices')],
-        "Product Prices", default='total')
+        "Product Prices", default='subtotal')
 
     @api.model
     def get_default_sale_delivery_settings(self, fields):