Gesture Area: Match Status Bar height, Fixes

* Use positiveSpaceTopPadding instead of virtualCoreNaviHeight
* Remove virtualCoreNaviHeight settings entry
* Code cleanup in GestureArea.cpp
* UI Root Item positioning fixes

Open-WebOS-DCO-1.0-Signed-Off-By: Josh Palmer <jpalmerwatkins@me.com>

Conflicts:

	Src/base/settings/Settings.h
	Src/lunaui/lockscreen/TopLevelWindowManager.cpp