VOLDEV-23: Special:Contributions links to Message Walls broken (individual Threads okay)

@grunny @mroszka 

Copy/paste error was outputting the title of the page (`Message Wall:Username`) instead of a url to the page as the `href` for the link. Browsers took this to mean that it should be appended to the end of the url with a `/`, thus creating links to `/wiki/Special:Contributions/Message Wall:Username`. It fixed itself when filtered by namespace because that would cause it to use the copy/paste source, which was correct.