[PRQ#64632] Deletion Request for preflight-app

MarsSeed [1] filed a deletion request for preflight-app [2]: Broken: source 404 not found. Also unneeded: the main pdfbox [a] package now delivers the preflight app as well. [a]: https://aur.archlinux.org/packages/pdfbox [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/preflight-app/