Fixed GWT dependency exports.
Fixed GWT dependency exports.

POMs should never export a gwt-user dependency, and we don't need to export a gwt-servlet
dependency because that's only needed if one's webapp is going to use GWT RemoteServiceServlet.
PlayN games do not necessarily even have a webapp, let alone one that uses GWT remote services.

KoriSamui/PlayN,Just-/playn,Just-/playn,Just-/playn,KoriSamui/PlayN,Just-/playn,Just-/playn,KoriSamui/PlayN,KoriSamui/PlayN