[PRQ#50226] Deletion Request for heifthumbnailer

MarsSeed [1] filed a deletion request for heifthumbnailer [2]: Unneeded, now also broken third-party HEIF thumbnailer for KDE5's KIO library. KIO now supports reading and thumbnailing HEIF files via: kio-extras→kimageformats5→libheif [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/heifthumbnailer/