[PRQ#68108] Deletion Request for sunflower-nightly-git

MarsSeed [1] filed a deletion request for sunflower-nightly-git [2]: Broken since March 2022 (GitHub git:// source URL). Unneeded: upstream has no 'nightly' branch. This actually builds from the 'develop' branch. Enough to keep AUR/sunflower-git for that. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/sunflower-nightly-git/