Update emscripten.yml

Author: mcbarton

.github/workflows/emscripten.yml

@@ -840,8 +840,8 @@ jobs:
           python -m pip install jupyterlite-xeus jupyterlite-core jupyterlab notebook libarchive-c
           jupyter lite build --XeusAddon.prefix=${{ env.PREFIX }} --contents notebooks/xeus-cpp-lite-demo.ipynb --contents notebooks/smallpt.ipynb --contents notebooks/images/marie.png --contents notebooks/audio/audio.wav --output-dir dist
 
-      - name: Deploy preview
-        if: ${{ runner.os == 'macOS' }}
-        uses: rossjrw/pr-preview-action@v1
-        with:
-          source-dir: ./xeus-cpp/dist/
+    - name: Deploy preview
+      if: ${{ runner.os == 'macOS' }}
+      uses: rossjrw/pr-preview-action@v1
+      with:
+        source-dir: ./xeus-cpp/dist/