Add "Adwaita" filter option for search

[AmethystGosling169]

To search for Adwaita apps only.

[renner0e]

What desktop are you running? If you are not on KDE then it's gonna show this.

AFAIK, this is sourced from https://arewelibadwaitayet.com/

[AmethystGosling169]

It does appear but you can't search in there.

Either allow a searching inside the category itself or filtering for adwaita apps in the global search.