[Etoys] [FIX]ColorPickerMorph tracking gray

[Yoshiki Ohshima]

  Karl,

> I noticed that the little circle tracking the picked up color was 
> misaligned on grayscale.
> I changed the hue value from 0.0 to 240.0 and it works better.

  I couldn't quite figure out how to illustrate the problem best.  I
put a ColorChart on Display and open a color picker (so you have two
rainbow chart on screen) and tracking seems to be ok.

-- Yoshiki