Creating default implementation for state lisnter method

> The transition start is used rarely

Change-Id: I0d33f0f6372eb4ef89bfbb66968612693b7c6033

src/com/android/launcher3/views/WorkEduView.java

@@ -188,11 +188,6 @@ public class WorkEduView extends AbstractSlideInView implements Insettable {
         }
 
         LauncherStateManager.StateListener listener = new LauncherStateManager.StateListener() {
-            @Override
-            public void onStateTransitionStart(LauncherState toState) {
-
-            }
-
             @Override
             public void onStateTransitionComplete(LauncherState finalState) {
                 if (finalState != LauncherState.ALL_APPS) return;