Add a ghost icon in the anonymous drive

www/drive/app-drive.less

@@ -547,6 +547,10 @@ span {
             cursor: pointer;
             opacity: 0.5;
             padding: 0;
+            flex-flow: column;
+            align-items: center;
+            justify-content: center;
+            display: inline-flex;
             &:hover {
                 opacity: 0.7;
             }

www/drive/inner.js

@@ -2052,6 +2052,7 @@ define([
                 $element.data('context', 'default');
                 $container.append($element);
             });
+            createGhostIcon($container);
         };
 
         var displayTrashRoot = function ($list, $folderHeader, $fileHeader) {