WebUI Fixes

Some hot fixes...
Even if this is broken, it has a purpose. I fixed it <a href="https://github.com/pmzqla/qBittorrent/commit/2157b7da99143ba0fb2cb8969fc9d79f598b2ca2">here</a>. Some browsers (I know for sure IE <= 9) need this to close the iframe from which a torrent files are uploaded.