community/snapshot: upgrade to 47.1
See https://gitlab.gnome.org/GNOME/snapshot/-/releases/47.1
The release includes:
- https://gitlab.gnome.org/GNOME/snapshot/-/merge_requests/316, allowing us to drop the backport fix.
- https://gitlab.gnome.org/GNOME/snapshot/-/merge_requests/317
For pmOS see also https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/5710