fix hiding tooltip on mobile devices

assets/js/main.js

@@ -227,5 +227,7 @@ window.addEventListener('load', function() {
         sumorobot = new Sumorobot(`ws://${ROBOT_SERVER}`, robotId);
         // Hide the configuration panel
         $('#panel').hide();
+        // Hide the tooltip, necessary on mobile devices
+        $('[data-toggle="tooltip"]').tooltip('hide');
     });
 });