BHV-10443 : Moonstone Component Bug for ExpandableListItem.

Bug: Although header text area is tapped with 5-way button, the drawer does not open. 
Fix: SpotlightFocus and tap event handling point are moved from header component to headerContainer component

DCO-1.1-Signed-Off-By: SoonGil Choi soongil.choi@lge.com