KDE: Re-introduce some essential packages
No Flatpak available yet:
- firewall-config
- khelpcenter
- kmag
- kmenuedit
- plasma-desktop-doc
Can not be turned into a Flatpak (yet?):
- kcm_systemd
- kdegraphics-thumbnailers
- pinentry-qt
- plasma-workspace-geolocation
- qt-at-spi