Make the navigation bar opaque.

The HW composer was getting confused by the transparent
window (which was a holdover from a previous design for
lights-out/fullscreen mode).

Bug: 5155982
Change-Id: I548e1b2b3b012aecba96ccf022730a9bd289e003
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index 71cbc61..2e14bef 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -468,7 +468,7 @@
                     | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                     | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
                     | WindowManager.LayoutParams.FLAG_SLIPPERY,
-                PixelFormat.TRANSLUCENT);
+                PixelFormat.OPAQUE);
 
         lp.setTitle("NavigationBar");
         switch (rotation) {