Trac #6836: improved icon for TurtleArt activity.
Trac #6836: improved icon for TurtleArt activity.

max630/turtleart-hacks,AlanJAS/turtleart,walterbender/turtleartmini,walterbender/turtle3D,walterbender/turtleconfusion,walterbender/turtleflags,walterbender/AmazonasTortuga,max630/turtleart-hacks,walterbender/turtleart