Removed an else clause to fix Chrome touch issue

This for me fixes Issue #16.  The else clause was causing the tooltip event handler to never be fired, because window.Touch now returns true even on a machine where you only have a mouse.  Removing it means that mouse events now work on desktop chrome as well as touch events.  I sadly don't have a chromebook with touch to test whether it works fine using both a mouse and touch at the same time, but I think it should be fine.