Small issue in the options panel

If you change the background color of an element, you get a new option in the options panel BG Opacity which defaults to 1, if you choose one of the options Opacity 10, Opacity 25, Opacity 50 or Opacity 75 the element get a class bg-opacity-x. If you later choose default again the class bg-opacity -x is not removed from the element and you can never get the default opacity back again