fix fill syntax when saving to SVG (#3423)
fix fill syntax when saving to SVG (#3423)

walterbender/turtleart,walterbender/turtleflags,walterbender/turtleartmini,AlanJAS/turtleart,walterbender/turtleconfusion,walterbender/turtle3D,walterbender/AmazonasTortuga