toolbar.py: Fix redirect issue when going to "reddit.com/www.some-url.com"

I liked the convenience of being able to submit a URL by typing "reddit.com/" before it, but at some point it stopped working properly. It would, oddly enough, redirect to a url that looks like "/submit?%3Furl=". The solution was thankfully as simple as removing one character.

Also, sorry if the commit history looks weird on my pull requests, I am still a git when it comes to git