treewide: use attrs instead of list for types.loaOf options

nixos/modules/services/system/dbus.nix

@@ -68,10 +68,7 @@ in
 
     environment.systemPackages = [ pkgs.dbus.daemon pkgs.dbus ];
 
-    environment.etc = singleton
-      { source = configDir;
-        target = "dbus-1";
-      };
+    environment.etc."dbus-1".source = configDir;
 
     users.users.messagebus = {
       uid = config.ids.uids.messagebus;

nixos/modules/services/system/localtime.nix

@@ -35,6 +35,10 @@ in {
     # Install the systemd unit.
     systemd.packages = [ pkgs.localtime.out ];
 
+    users.users.localtimed = {
+      description = "Taskserver user";
+    };
+
     systemd.services.localtime = {
       wantedBy = [ "multi-user.target" ];
       serviceConfig.Restart = "on-failure";