a2a03252c6
Fluid (Smoke/Liquid) has its own UI (uses `PHYSICS_PT_cache` in
`properties_physics_fluid.py`), does not use `point_cache_ui` at all.
It seems 4235fe37d6 should have done this already.
Afaict, this is also not relevant for loading old (e.g. 2.79) files with
the old smoke system (since their caches wont be read anyways).
Pull Request: https://projects.blender.org/blender/blender/pulls/117404