nixos/modules: users.(extraUsers|extraGroup->users|group)

nixos/modules/services/games/minecraft-server.nix

@@ -45,7 +45,7 @@ in
   };
 
   config = mkIf cfg.enable {
-    users.extraUsers.minecraft = {
+    users.users.minecraft = {
       description     = "Minecraft Server Service user";
       home            = cfg.dataDir;
       createHome      = true;

nixos/modules/services/games/minetest-server.nix

@@ -79,7 +79,7 @@ in
   };
 
   config = mkIf cfg.enable {
-    users.extraUsers.minetest = {
+    users.users.minetest = {
       description     = "Minetest Server Service user";
       home            = "/var/lib/minetest";
       createHome      = true;

nixos/modules/services/games/terraria.nix

@@ -105,14 +105,14 @@ in
   };
 
   config = mkIf cfg.enable {
-    users.extraUsers.terraria = {
+    users.users.terraria = {
       description = "Terraria server service user";
       home        = "/var/lib/terraria";
       createHome  = true;
       uid         = config.ids.uids.terraria;
     };
 
-    users.extraGroups.terraria = {
+    users.groups.terraria = {
       gid = config.ids.gids.terraria;
       members = [ "terraria" ];
     };