Fix camera not launching immediately from Keyguard

Seems like a line got lost in one of the many refactors :-)

Also adds debug statements for UnknownAppVisibilityController.

Test: Launch camera from lockscreen, make sure no delay.
Change-Id: Idb49b8dcfd2ce351a62d46d93a917a791d38caa1
diff --git a/services/core/java/com/android/server/wm/AppWindowToken.java b/services/core/java/com/android/server/wm/AppWindowToken.java
index 0844d48..5d739d1 100644
--- a/services/core/java/com/android/server/wm/AppWindowToken.java
+++ b/services/core/java/com/android/server/wm/AppWindowToken.java
@@ -413,6 +413,7 @@
         boolean delayed = setVisibility(null, false, TRANSIT_UNSET, true, voiceInteraction);
 
         mService.mOpeningApps.remove(this);
+        mService.mUnknownAppVisibilityController.appRemoved(this);
         waitingToShow = false;
         if (mService.mClosingApps.contains(this)) {
             delayed = true;