Remove extra scrollbar in editor left menu modal container

GitOrigin-RevId: fe19e4a1f5017899f076db884d881c0d95fc6b70

services/web/frontend/stylesheets/app/editor/left-menu.less

@@ -194,6 +194,7 @@
 // Make the Bootstrap Modal behavior as a left sidebar
 #left-menu-modal {
   opacity: 1;
+  overflow-y: hidden;
   .modal-dialog {
     height: 100%;
     margin: 0;