Adds missing break after last statement in switch

Test: no functional change
Bug: 123542488
Change-Id: I756755324e7a59e58affc13c272c8154425b8363

packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListeners.java

@@ -354,6 +354,7 @@ public class TaskStackChangeListeners extends TaskStackListener {
                             mTaskStackListeners.get(i).onBackPressedOnTaskRoot(
                                     (RunningTaskInfo) msg.obj);
                         }
+                        break;
                     }
                 }
             }