Prevent showing opaque area for systemui when in expanded desktop

Change-Id: I1434613e247687cd441e95c9ec90967317b1e737
Port AppSidebar to Kitkat (2/2)

Change-Id: I296059a3cc688a567e7e90cccfdf4b8e824cfedf

Conflicts:
	packages/SystemUI/AndroidManifest.xml
	packages/SystemUI/res/values/bk_styles.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java