Revert "When the enabled gestures is changed we need to call ReleaseAllTouches().  While testing on iOS I found that changing the EnabledGestures while a drag is occurring on the hardware will result in an infinite loop due to partial state being recorded - the IsGestureAvailable call will loop forever."

This reverts commit afabd4db5c8d57181e54c893813eb3fbf60ff529.