refactor: changed sparky fire zone

lib/game/components/sparky_fire_zone.dart

@@ -1,8 +1,6 @@
 // ignore_for_file: avoid_renaming_method_parameters
 
 import 'package:flame/components.dart';
-import 'package:flame_forge2d/flame_forge2d.dart';
-import 'package:flutter/material.dart';
 import 'package:pinball/flame/flame.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
@@ -41,16 +39,3 @@ class _SparkyBumperController extends ComponentController<SparkyBumper>
     isActivated = !isActivated;
   }
 }
-
-/// Listens when a [Ball] bounces bounces against a [SparkyBumper].
-class ControlledSparkyBumperBallContactCallback
-    extends ContactCallback<Controls<_SparkyBumperController>, Ball> {
-  @override
-  void begin(
-    Controls<_SparkyBumperController> controlledSparkyBumper,
-    Ball _,
-    Contact __,
-  ) {
-    controlledSparkyBumper.controller.hit();
-  }
-}

test/game/components/sparky_fire_zone_test.dart

@@ -24,14 +24,7 @@ void main() {
           controlledSparkyBumper = ControlledSparkyBumper();
           await game.ensureAdd(controlledSparkyBumper);
 
-          final callback = ControlledSparkyBumperBallContactCallback();
+          controlledSparkyBumper.controller.hit();
-          game.addContactCallback(callback);
-
-          callback.begin(
-            controlledSparkyBumper,
-            MockBall(),
-            MockContact(),
-          );
         },
         verify: (game, tester) async {
           expect(controlledSparkyBumper.controller.isActivated, isTrue);
@@ -44,19 +37,8 @@ void main() {
           controlledSparkyBumper = ControlledSparkyBumper();
           await game.ensureAdd(controlledSparkyBumper);
 
-          final callback = ControlledSparkyBumperBallContactCallback();
+          controlledSparkyBumper.controller.hit();
-          game.addContactCallback(callback);
+          controlledSparkyBumper.controller.hit();
-
-          callback.begin(
-            controlledSparkyBumper,
-            MockBall(),
-            MockContact(),
-          );
-          callback.begin(
-            controlledSparkyBumper,
-            MockBall(),
-            MockContact(),
-          );
         },
         verify: (game, tester) async {
           expect(controlledSparkyBumper.controller.isActivated, isFalse);