Remove weird invisible non-ASCII character.
Remove weird invisible non-ASCII character.

Previously we'd get this when deploying:

    Invalid US-ASCII character "\xE2"
      (in /Users/james/Code/freerange/alphagov/whitehall/app/assets/stylesheets/admin.css)

    Tasks: TOP => assets:precompile:primary
    (See full trace by running task with --trace)

askl56/whitehall,hotvulcan/whitehall,hotvulcan/whitehall,robinwhittleton/whitehall,alphagov/whitehall,robinwhittleton/whitehall,askl56/whitehall,alphagov/whitehall,hotvulcan/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,ggoral/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,askl56/whitehall,askl56/whitehall,robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,ggoral/whitehall,ggoral/whitehall,hotvulcan/whitehall