base: fix volumen panel traslucent after stream icon click

Change-Id: I290ecb07106198882739a5b734f4d6a89d3eb5fb
JIRA: CYAN-4487
Issue: https://jira.cyanogenmod.org/browse/CYAN-4487
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>

Conflicts:
	core/java/android/view/VolumePanel.java