Delete trailing spaces

Author: tannewt

supervisor/shared/web_workflow/static/welcome.html

@@ -28,6 +28,6 @@ <h2>Device Info</h2>
     </dl>
     <h2>Here are other CircuitPython devices on your network:</h2>
     <ul id="devices">
-    </ul>    
+    </ul>
 </body>
 </html>