fix "showing double whatsnew screen on first start" once again ;)

src/com/owncloud/android/MainApp.java

@@ -142,7 +142,6 @@ public class MainApp extends Application {
             @Override
             public void onActivityStopped(Activity activity) {
                 Log_OC.d(activity.getClass().getSimpleName(), "onStop() ending" );
-                WhatsNewActivity.runIfNeeded(activity);
                 PassCodeManager.getPassCodeManager().onActivityStopped(activity);
             }