Use INVISIBLE instead of GONE to hide KG transport buttons

Maintain a stable/predictable button layout when a remote control
client shows or hides specific transport control buttons.

Bug 11195246

Change-Id: I0e745150127c5e354ed2752c379e05ea8e0bd33d

packages/Keyguard/src/com/android/keyguard/KeyguardTransportControlView.java

@@ -511,7 +511,7 @@ public class KeyguardTransportControlView extends FrameLayout {
         if ((flags & flag) != 0) {
             view.setVisibility(View.VISIBLE);
         } else {
-            view.setVisibility(View.GONE);
+            view.setVisibility(View.INVISIBLE);
         }
     }