Doesnt redirect with URL prefix

If you set the blog url to something like:
"https://blog.ghost.org/ghost"

Going to a valid URL without the slash is going to take you to bad places:
"https://blog.ghost.org/ghost" --> "https://blog.ghost.org/ghost/ghost"

Fix: Assume the URL is valid, and don't slap on the prefix, since connect-slashes isn't responsible for this kind of validation.