GF-35832: Address spotlight issues encountered while debugging moon.Drawers oddities:
GF-35832: Address spotlight issues encountered while debugging moon.Drawers oddities:

* In container, when checking for lastFocusedChild, use enyo.Spotlight.isSpottable rather than just lastFocusedChild.destroyed.  isSpottable checks for destroyed, as well as hidden, disabled, etc., which is more robust.

Enyo-DCO-1.1-Signed-Off-By: Kevin Schaaf (kevin.schaaf@lge.com)

kidaa/spotlight,mcanthony/spotlight,enyojs/spotlight