fix: CenterPageEnlargeStrategyy.zoom not working correctly with scrollDirection: vertical

Author: LowLevelSubmarine

lib/carousel_slider.dart

@@ -235,10 +235,11 @@ class CarouselSliderState extends State<CarouselSlider>
  }
  if (widget.options.enlargeStrategy == CenterPageEnlargeStrategy.zoom) {
  late Alignment alignment;
+ final bool horizontal = options.scrollDirection == Axis.horizontal;
  if (itemOffset > 0) {
- alignment = Alignment.centerRight;
+ alignment = horizontal? Alignment.centerRight : Alignment.bottomCenter;
  } else {
- alignment = Alignment.centerLeft;
+ alignment = horizontal? Alignment.centerLeft : Alignment.topCenter;
  }
  return Transform.scale(child: child, scale: scale, alignment: alignment);
  }