[plasmoid, libkcups]: Remove unneeded PrinterSortFilterModel
Use the frameworks KItemModels version instead.
Was used only by the plasmoid. Was just added as QML Element in Plasma6 and none of the legacy printer manager apps use it.
Use the frameworks KItemModels version instead.
Was used only by the plasmoid. Was just added as QML Element in Plasma6 and none of the legacy printer manager apps use it.