Update notification dots in Taskbar All Apps.

AllAppsStore already has the business logic for this, we just were not
piping along to it.

Test: Dismiss notification from tray while All Apps is open, and dot
should go away in All Apps.
Fix: 277925243

Change-Id: I29c5723fd77d22f683f5518bd6e2e3206ddee999

quickstep/src/com/android/launcher3/taskbar/TaskbarPopupController.java

@@ -137,6 +137,7 @@ public class TaskbarPopupController implements TaskbarControllers.LoggableTaskba
         if (folder != null) {
             folder.iterateOverItems(op);
         }
+        mControllers.taskbarAllAppsController.updateNotificationDots(updatedDots);
     }
 
     /**