upstream: fix geoclue2 location api endpoint

[3ulalia]

With Mozilla ending support for its location service (NixOS/nixpkgs#321121), for services like wlsunset or gammastep to be able to determine location, there should be an alternate location provider - ideally, not Google's.

[3ulalia]

https://beacondb.net/ seems like a reasonable option. Alternatively, relying on the presence of an Avahi device on the local network isn't entirely unreasonable.

[3ulalia]

https://konstantintutsch.com/blog/beacondb-geolocation-on-linux-gnome/