Discard tabSelectedEvent if tab was already selected

android/app/src/main/java/com/reactnativenavigation/layouts/BottomTabsLayout.java

 
     @Override
     public boolean onTabSelected(int position, boolean wasSelected) {
+        if (wasSelected) {
+            return false;
+        }
+        
         hideCurrentStack();
         showNewStack(position);
         EventBus.instance.post(new ScreenChangedEvent(getCurrentScreenStack().peek().getScreenParams()));