another mistake after refactor

nixos/modules/nixos/services/podman/default.nix

@@ -40,12 +40,12 @@ in
       networking.firewall.interfaces.podman0.allowedUDPPorts = [ 53 ];
 
       # extra user for containers
+      users.groups.kah = { };
       users.users = {
         kah = {
           uid = 568;
           group = "kah";
         };
-        groups.kah = { };
         jahanson.extraGroups = [ "kah" ];
       };
     };