Remove unnecessary methods.

src/itdelatrisu/opsu/objects/Slider.java

@@ -451,9 +451,6 @@ public class Slider implements HitObject {
 		return false;
 	}
 
-	@Override
-	public OsuHitObject getHitObject() { return hitObject; }
-
 	@Override
 	public void updatePosition() {
 		this.x = hitObject.getScaledX();