BHV-12085: Altered the CSS for drawer activator to not conflict with spotlight discovery.

The increased height of the new design of the activator pushed the activator into un-findable territory for spotlight, requiring this change. The activator is now a zero-height div container with the bar and the nub being pseudo-elements which change based on the classes of their owner.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>