Fix trackball selection on the desktop (not all apps, yet)

AllApps view is always visible (in the View sense), which was causing it
to take focus when it should not have. Changed Launcher to manually
turn on/off the focusability of AllApps as it appears/disappears.

src/com/android/launcher2/AllAppsView.java

@@ -374,6 +374,7 @@ public class AllAppsView extends RSSurfaceView
         return mRollo.mMessageProc.mZoom > 0.001f;
     }
 
+    /*
     @Override
     public boolean onTrackballEvent(MotionEvent ev)
     {
@@ -386,6 +387,7 @@ public class AllAppsView extends RSSurfaceView
 
         return true;
     }
+    */
 
     public void setApps(ArrayList<ApplicationInfo> list) {
         mAllAppsList = list;