fix(minecraft-servers): don't createHome for user, use mkdir instead

Using createHome forces a specific set of permissions on the folder,
which prevents it from being accessed by the minecraft group.

Creating the folder from the service instead allows for it to have the
correct permissions.

modules/functionality/minecraft-servers.nix

@@ -54,7 +54,6 @@ in
         users.users.minecraft = {
           description = "Minecraft server service user";
           home = cfg.dataDir;
-          createHome = true;
           isSystemUser = true;
           group = "minecraft";
         };