message: [setup] fix setup without `WEB_GUI`
diff: @@ -112,7 +112,7 @@ otbr_install()
  without WEB_GUI || sudo systemctl enable otbr-web || true
  sudo systemctl enable otbr-agent || true
  sudo systemctl is-enabled otbr-agent || die 'Failed to enable otbr-agent!'
  - sudo systemctl is-enabled otbr-web || die 'Failed to enable otbr-web!'
  + without WEB_GUI || sudo systemctl is-enabled otbr-web || die 'Failed to enable otbr-web!'
  else
  echo >&2 ' *** WARNING: systemctl not found. otbr cannot start on boot.'
  fi
  