Toggling alt assets prevents alt models from loading under some situations.

[sitton76]

I had set up my custom model mod to load only when Alternate Assets was enabled, and when messing around with the settings I found a case where it would stop loading the model mod.

Steps to reproduce:

1. Have a model mod that is set up to load when Alternate Assets is enabled.
2. Start game with Alternate Assets enabled.
3. Pull out modified item, toggle off Alternate Assets and re-enable it.
4. Reload the map, the model won't load regardless of Alternate Assets toggle state.

Restarting SoH fixes the issue however.

Using Sulu Alfa(7.1.0) with OpenGL graphics backend, Linux Performance build.

2023-07-10.21-41-00.mp4

[Archez]

Fix from #3420 was merged in #3434 and available in MacReady Delta (8.0.3)