Remove ball when replay ends

rust/src/replay.rs

@@ -148,6 +148,9 @@ impl INode for ReplayPlayback {
                 character.queue_free();
                 self.player_characters.remove(&id);
             }
+            if let Some(mut ball) = self.ball.take() {
+                ball.queue_free();
+            }
         }
     }