fix: ball spawn logic

lib/game/components/controlled_ball.dart

@@ -88,7 +88,7 @@ class LaunchedBallController extends BallController
   void onNewState(GameState state) {
     super.onNewState(state);
     component.shouldRemove = true;
-    if (state.balls > 1) gameRef.spawnBall();
+    if (state.balls >= 1) gameRef.spawnBall();
   }
 
   /// Removes the [Ball] from a [PinballGame]; spawning a new [Ball] if

test/game/components/controlled_ball_test.dart

@@ -176,7 +176,7 @@ void main() {
             await game.ensureAdd(ball);
 
             final state = MockGameState();
-            when(() => state.balls).thenReturn(1);
+            when(() => state.balls).thenReturn(0);
 
             final previousBalls = game.descendants().whereType<Ball>().toList();
             controller.onNewState(state);