[PRQ#49725] Deletion Request for threemawebqt

MarsSeed [1] filed a deletion request for threemawebqt [2]: Unused, discontinued, unofficial client from 2018. Users should use either the official threema-desktop or the unofficial threema-for-desktop, Both available on AUR. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/threemawebqt/