style: remove trailing whitespace

gns3server/api/routes/compute/notifications.py

@@ -67,7 +67,7 @@ if __name__ == "__main__":
             <ul id='messages'>
             </ul>
             <script>
-                var ws = new WebSocket("ws://localhost:8000/notifications/ws");        
+                var ws = new WebSocket("ws://localhost:8000/notifications/ws");
                 ws.onmessage = function(event) {
                     var messages = document.getElementById('messages')
                     var message = document.createElement('li')