Start listening on notifications/QS panels on expansion started

Now that there are QS tiles in the header, they need to be in the
listening state as soon as the expansion starts so they can be
up to date by the time the user sees them.

Change-Id: I80550d2885bd86afce3ea1595d441e65298d4d7c
Fixes: 30041004
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 64f205d..3b67c59 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -1612,6 +1612,9 @@
         if (mQsExpanded) {
             onQsExpansionStarted();
         }
+        // Since there are QS tiles in the header now, we need to make sure we start listening
+        // immediately so they can be up to date.
+        mQsContainer.setHeaderListening(true);
     }
 
     @Override