dont check for filecache updates when getting quota info over webdav

lib/connector/sabre/directory.php

@@ -146,7 +146,7 @@ class OC_Connector_Sabre_Directory extends OC_Connector_Sabre_Node implements Sa
 	 * @return array
 	 */
 	public function getQuotaInfo() {
-		$rootInfo=OC_FileCache::get('');
+		$rootInfo=OC_FileCache_Cached::get('');
 		return array(
 			$rootInfo['size'],
 			OC_Filesystem::free_space()