nixos/librenms: Use new Artisan Console Command (#503180)

          # convert rrd files when the oneMinutePolling option is changed

          OLD_ENABLED=$(cat ${cfg.dataDir}/one_minute_enabled)

          if [[ $OLD_ENABLED != "${lib.boolToString cfg.enableOneMinutePolling}" ]]; then

            ${package}/scripts/rrdstep.php -h all

            ${artisanWrapper}/bin/librenms-artisan maintenance:rrd-step all

            echo "${lib.boolToString cfg.enableOneMinutePolling}" > ${cfg.dataDir}/one_minute_enabled

          fi