Fix command in action

Author: craquet

.github/workflows/deploy-github-pages.yml

@@ -30,6 +30,6 @@ jobs:
       - uses: bitovi/github-actions-storybook-to-github-pages@v1.0.3
         with:
           install_command: npm ci # default: npm ci
-          build_command: npm run build-storybook # default: npm run build-storybook
+          build_command: npm run storybook:build # default: npm run build-storybook
           path: storybook-static # default: dist/storybook
           checkout: false # default: true