QS: Fix QuickQS visibility at non-first page

When user collapsed QSPanel at non-first page, QuickQS always remained
View.Visible. When user canceled collapsing, QQS remained clickable
although invisible to user(alpha = 0).
QQS must be non-clickable when user cancels collapsing at non-first page.

Test: QSPanel > 2nd page > Cancel collapsing while collapse QSPanel
      > Verify invisible QQS is non-clickable

Change-Id: I4c1f195a3faec8e89bb073443f6345f4faddf781

packages/SystemUI/src/com/android/systemui/qs/QSAnimator.java

@@ -357,6 +357,11 @@ public class QSAnimator implements Callback, PageListener, Listener, OnLayoutCha
 
     private final TouchAnimator.Listener mNonFirstPageListener =
             new TouchAnimator.ListenerAdapter() {
+                @Override
+                public void onAnimationAtEnd() {
+                    mQuickQsPanel.setVisibility(View.INVISIBLE);
+                }
+
                 @Override
                 public void onAnimationStarted() {
                     mQuickQsPanel.setVisibility(View.VISIBLE);