change(example): remove cancel swipe example on OnSwipe callback

* It was removed because it can cause users to think that there is a bug
  in the library, because the swipe is canceled

example/lib/main.dart

@@ -81,14 +81,6 @@ class _ExamplePageState extends State<Example> {
     int? currentIndex,
     CardSwiperDirection direction,
   ) {
-    if (currentIndex?.isEven == true && direction == CardSwiperDirection.left ||
-        currentIndex?.isOdd == true && direction == CardSwiperDirection.right) {
-      debugPrint(
-        'the card $currentIndex was swiped to the: ${direction.name}; Oh, and also your action got canceled',
-      );
-      return false;
-    }
-
     debugPrint(
       'the card $previousIndex was swiped to the ${direction.name}. Now the card $currentIndex is on top',
     );