nixos/privatebin: fix defaultText

    group = lib.mkOption {

      type = lib.types.str;

      default = if cfg.enableNginx then "nginx" else defaultGroup;

      defaultText = "If `services.privatebin.enableNginx` is true then `nginx` else ${defaultGroup}";

      defaultText = lib.literalExpression "if config.services.privatebin.enableNginx then \"nginx\" else \"${defaultGroup}\"";

      description = ''

        Group under which privatebin runs. It is best to set this to the group

        of whatever webserver is being used as the frontend.

  };

  config = lib.mkIf cfg.enable {

    services.privatebin.settings = {

      main = lib.mkDefault { };

      model.class = lib.mkDefault "Filesystem";