Bridges.tpo <select> UI broken in FF30+

See http://imgur.com/a/elTR8 (the top one is FF31)

For more info - https://bugzilla.mozilla.org/show_bug.cgi?id=649849

Isis has some thoughts -

@isis: we have the constraints that we *still* have to support IE6, plus we can't/won't have JS
@isis: thanks! i won't have time for this for a while, but if you want it done sooner, i'd gladly take a patch to
              https://gitweb.torproject.org/bridgedb.git/blob/HEAD:/lib/bridgedb/templates/assets/css/custom.css

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