AppletConfiguration: port to KItemModels.KSortFilterProxyModel
This lets us get rid of the last PlasmaCore import in the file.
Requires https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/431.
Edited by Nate Graham
This lets us get rid of the last PlasmaCore import in the file.
Requires https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/431.