Fixed a bug where a wrong notification could be visible

Because we were not looking at the wrong state and ignoring
gone.

Test: add 4 notifications, pull down and tap on bottom continuously
Change-Id: Ic4370fa89525802ed99377da215085d84642a174

packages/SystemUI/src/com/android/systemui/statusbar/stack/ViewState.java

@@ -594,7 +594,7 @@ public class ViewState {
     }
 
     protected void onYTranslationAnimationFinished(View view) {
-        if (hidden) {
+        if (hidden && !gone) {
             view.setVisibility(View.INVISIBLE);
         }
     }