Fix so that subtypes of cm:folder can be seen in doclibrary tree

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@14270 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

config/alfresco/templates/webscripts/org/alfresco/slingshot/documentlibrary/treenode.get.js

@@ -22,7 +22,7 @@ function getTreenode(siteId, path)
       // Look for folders in the parentNode
       for each(item in parsedArgs.parentNode.children)
       {
-         if (item.type == "{http://www.alfresco.org/model/content/1.0}folder")
+         if (item.isSubType("cm:folder"))
          {
             items.push(item);
          }