[FIX] calamares_desktop

[Akash6222]

• [x] remove https://github.com/tcet-opensource/tcet-linux/blob/3d53bf6a626490dde766f36fbf757d6bd0074c2d/airootfs/usr/local/bin/tl-finalisation#L17
• [x] fix tcet-opensource/tcet-linux-installer-config#6