refactor: cleaned PinballCanvasComponent

lib/game/pinball_game.dart

@@ -48,7 +48,6 @@ class PinballGame extends Forge2DGame
 
     await add(
       PinballCanvasComponent(
-        camera: camera,
         children: [
           BoardBackgroundSpriteComponent(),
           Multipliers(),

packages/pinball_flame/lib/src/rendering/pinball_canvas.dart

@@ -5,19 +5,12 @@ import 'dart:ui';
 
 import 'package:flame/components.dart';
 import 'package:flame/extensions.dart';
-import 'package:flame/game.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:pinball_flame/src/rendering/rendering.dart';
 
 class PinballCanvas implements Canvas {
-  PinballCanvas({
-    required this.camera,
-  });
-
   late Canvas canvas;
 
-  Camera camera;
-
   final List<Rendering> _zBuffer = [];
 
   void buffer(Rendering rendering) => _zBuffer.add(rendering);

packages/pinball_flame/lib/src/rendering/pinball_canvas_component.dart

@@ -8,9 +8,8 @@ import 'package:pinball_flame/src/rendering/rendering.dart';
 
 class PinballCanvasComponent extends Component {
   PinballCanvasComponent({
-    required Camera camera,
     Iterable<Component>? children,
-  })  : _pinballCanvas = PinballCanvas(camera: camera),
+  })  : _pinballCanvas = PinballCanvas(),
         super(children: children);
 
   final PinballCanvas _pinballCanvas;

packages/pinball_flame/lib/src/rendering/rendering_mixin.dart

@@ -8,11 +8,8 @@ mixin Rendering on Component {
   int zIndex = 0;
 
   @override
-  void renderTree(Canvas canvas) {
+  void renderTree(
-    if (canvas is PinballCanvas) {
+    covariant PinballCanvas canvas,
+  ) =>
       canvas.buffer(this);
-    } else {
-      super.renderTree(canvas);
-    }
-  }
 }