Fixed Box Cat key hook

I failed the print of the box for the original model 4 times due to the lever/hinge printing in thin air + being a small, rounded, over-hang. This is a good receipe for failure, at least at higher speeds. Instead of slowing the print down I decided I'd go ahead and attempt to fix the problem. The assembly is now in more parts, you can look at the 3D model to see where everything goes. Hopefully this saves some filaments for others that would have had numerous failed prints like me. Thankfully exclude object exists in Klipper 🙏