Fix BeatDivisorControl allow to select value outside of VALID_DIVISORS

osu.Game/Screens/Edit/Compose/Components/BeatDivisorControl.cs

@@ -279,6 +279,10 @@ protected override void OnDrag(DragEvent e)
                 handleMouseInput(e.ScreenSpaceMousePosition);
             }
 
+            protected override void OnDragEnd(DragEndEvent e)
+            {
+            }
+
             private void handleMouseInput(Vector2 screenSpaceMousePosition)
             {
                 // copied from SliderBar so we can do custom spacing logic.