Remove swimsuit shoulder strap self-intersection

This addresses one of the rendering errors mentioned here:
hfg-gmuend#93 (comment)

The cause of this rendering error was that the path which makes up the top of the swimsuit had a self-intersection near the left shoulder-strap. 
The fix was to very slightly adjust one of the coordinates in the curve to remove the self-intersection.
This change will very slightly change the appearance of the rendered image.