Fix for z-order of overlapping wheel images

[Billiam]

Fixes the z-order of the list image in the wheel. Mostly relevant when wheel radius is smaller and/or wheel angle is low so that overlap is more visible.

Before (from master)

https://github.com/mjrgh/PinballY/assets/242008/7816e8dd-530f-43ca-bd90-1a7728acecf3

After

https://github.com/mjrgh/PinballY/assets/242008/33e6b4e6-4ba3-4f1e-8402-59667a5d36a7