fix: display recent/favourited models both in recents/favourites subgrouping and under their provider (resolves #3874)

[ariane-emory]

This PR corrects a behaviour that is currently surprising some users, where recent/favourited models are displayed in only the recents/favourites subsection of the /models list and not under their original provider. After this PR, recent/favourited models will show up in the list both under the recents/favourites grouping and under their actual provider.

Resolves #3874.