fix mobile 'add more' button goes to homepage

[philipxyc]

The problem and the solution is from: https://forum.tastyigniter.com/d/2886-add-more-items-not-working

[sampoyigi]

{{ restaurant_url('local/menus') }} should redirect to the menus page not homepage..

[philipxyc]

The problem is restaurant_url('local/menus') is not always the menu url of the location you are ordering. For my case, I have a location named test, and it is set to the default location. the restaurant_url('local/menus') here gives me {domain}/default/menus. I even don't have a location called default, so the URL panic and redirects us to the homepage.