fix the this: https://trello.com/c/Bgun5Hhe/340-global-search-redirects-to-wrong-page-for-guides

the substring bit isn't really necessary. but it's just to make sure it's actually at the start of the string. in case something ever returned

"france/hotels/something?image=http://img.proxy.com/something.png" or whatever

i would even think that `item.slug.indexOf('://')` would probably be fine and would be fast