Closes "New" dropdown when switching category

* fixes #16394
* return false - stops all following event callbacks

apps/files/js/navigation.js

@@ -124,7 +124,7 @@
 			var $target = $(ev.target);
 			var itemId = $target.closest('li').attr('data-id');
 			this.setActiveItem(itemId);
-			return false;
+			ev.preventDefault();
 		}
 	};