CI: Use the correct MacOS path in web-benchmarks job

.github/workflows/web-benchmarks.yml

@@ -122,10 +122,13 @@ jobs:
           source .venv/bin/activate
           python3 -m pip install -r requirements.txt
 
-          run_options='--iterations=5'
-          run_options="${run_options} --executable=${{ github.workspace }}/Install/bin/Ladybird"
+          if [ "${{ matrix.os_name }}" = "macOS" ]; then
+            executable="${{ github.workspace }}/Install/bundle/Ladybird.app/Contents/MacOS/Ladybird"
+          else
+            executable="${{ github.workspace }}/Install/bin/Ladybird"
+          fi
 
-          ./run.py ${run_options}
+          ./run.py --iterations=5 --executable="${executable}"
 
       - name: 'Save results as an artifact'
         uses: actions/upload-artifact@v7