Remove WorkingDirectory from worker service config

The WorkingDirectory option was removed from the worker service configuration because the lib directory was removed. This change was already applied to the app service but I forgot to remove it here as well

Author: mpscholten

NixSupport/nixosModules/services/worker.nix

@@ -10,7 +10,6 @@ in
         serviceConfig = {
             Type = "simple";
             Restart = "always";
-            WorkingDirectory = "${cfg.package}/lib";
             ExecStart = "${cfg.package}/bin/RunJobs";
         };
         environment =