fix: Fix SpriteBatch to comply with new drawAtlas requirement (#3338)

Fix SpriteBatch to comply with new drawAtlas requirement

Fixes: #3331

examples/lib/stories/sprites/sprite_batch_load_example.dart

@@ -20,6 +20,11 @@ class SpriteBatchLoadExample extends FlameGame {
 
 class MySpriteBatchComponent extends SpriteBatchComponent
     with HasGameReference<SpriteBatchLoadExample> {
+  MySpriteBatchComponent()
+      : super(
+          blendMode: BlendMode.srcOver,
+        );
+
   @override
   Future<void> onLoad() async {
     final spriteBatch = await game.loadSpriteBatch('boom.png');