BHV-5144: moon.Panels - change onTransitionStart to fires before pre-transition

BHV-5144: moon.Panels - change onTransitionStart to fires before pre-transition

Now, onTransitionStart fires after pre-transition work done when moving forward

So change transitionStart event firing time so that the event can fire before pre-transition.

Enyo-DCO-1.1-Signed-off-by: Sungbae Cho sb.cho@lge.com