function handlePlaylistPrev(playlist) {
    /*
      Ensure the playlist is the same as the active playlist. To get to change
      the scope to a new playlist, you need to play that playlist.
    */
    if (playlist == _config2.default.active_playlist) {
      _audioNavigation2.default.setPreviousPlaylist(_config2.default.active_playlist);
    } else {
      _debug2.default.writeMessage("You can not go to the previous song on a playlist that is not being played!");
    }
  }
Handles an event on a previous playlist button.

@access private
@prop {string} playlist  - The playlist we are handling the previous for.