nixos/gancio: add missing quotes to cli command, remove erroneous dash

    environment.systemPackages = [

      (pkgs.runCommand "gancio" { } ''

        mkdir -p $out/bin

        echo "#!${pkgs.runtimeShell}

        echo '#!${pkgs.runtimeShell}

        cd /var/lib/gancio/

          exec ${lib.getExe cfg.package} ''${1:---help}

        " > $out/bin/gancio

        exec ${lib.getExe cfg.package} ''${1:--help}

        ' > $out/bin/gancio

        chmod +x $out/bin/gancio

      '')

    ];