Update stylelint npm script

`rd` is set in .stylelintrc.json.

package.json

@@ -30,7 +30,7 @@
     "netlify": "cross-env-shell HUGO_BASEURL=$DEPLOY_PRIME_URL npm-run-all icons docs-build",
     "test:fusv": "fusv docs/assets/scss/",
     "test:eslint": "eslint --cache --cache-location node_modules/.cache/.eslintcache --report-unused-disable-directives .",
-    "test:stylelint": "stylelint docs/assets/scss/ --cache --cache-location node_modules/.cache/.stylelintcache --rd",
+    "test:stylelint": "stylelint docs/assets/scss/ --cache --cache-location node_modules/.cache/.stylelintcache",
     "test:lockfile-lint": "lockfile-lint --allowed-hosts npm --allowed-schemes https: --empty-hostname false --type npm --path package-lock.json",
     "test:vnu": "node build/vnu-jar.js",
     "test:check-icons": "node build/check-icons.js",