removed gitea DOMAIN

Failed assertions:
       - `services.gitea.settings.server.DOMAIN` was removed upstream and replaced by `services.gitea.settings.server.ROOT_URL`.

systems/jeeves/services/gitea.nix

@@ -23,7 +23,6 @@ in
       };
       service.DISABLE_REGISTRATION = true;
       server = {
-        DOMAIN = "gitea.tmmworkshop.com";
         ROOT_URL = "https://gitea.tmmworkshop.com/";
         HTTP_PORT = 6443;
         BUILTIN_SSH_SERVER_USER = "gitea";