add spacing at the bottom of the editor menu

GitOrigin-RevId: 117d34415dca6ce63018181298b9c349eae20127

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

@@ -54,6 +54,10 @@
 		}
 	}
 
+	> ul.nav:last-child {
+		margin-bottom: @line-height-computed / 2;
+	}
+
 	ul.nav-downloads {
 		li {
 			display: inline-block;