Second part to fix#130007, after 50f7666785.
When saving a new file with the current file asset library loaded, the
library wasn't converted properly to an on-disk library. While the
library was loaded again as on-disk library, the previous runtime
version of it wasn't cleared, so catalog definitions could be duplicated
across available libraries.
Make sure the runtime only library is destructed properly, and the UI
refreshed.
There seem to be more issues with converting the runtime current file library to
a on-disk current file library, but these can be addressed after the crashes and
hangs are fixed, see report.
Pull Request: https://projects.blender.org/blender/blender/pulls/133341
9a9e2e19a9