Fix bug where Wiki pages that include a '/' were no longer accessible
### What does this MR do?
This MR fixes a regression that caused Wiki pages that included a '/' to no longer be accessible.
### Are there points in the code the reviewer needs to double check?
Are there cases that `wiki_helper.rb` doesn't handle?
### Why was this MR needed?
The upgrade from Rails v4.1.2 to v4.1.9 (
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