nixos: services: remove pyload

The package and the module have been removed upstream.

I do not have the will to package the enormous V8-based missing
dependency (`mini-racer`), so let's remove the module entirely.

I didn't use it much anymore anyway.

modules/nixos/services/default.nix

@@ -31,7 +31,6 @@
     ./podgrab
     ./postgresql
     ./postgresql-backup
-    ./pyload
     ./quassel
     ./rss-bridge
     ./sabnzbd