remove parent write requirement

Author: ylebre

src/WAC.php

@@ -394,10 +394,6 @@ public function getRequestedGrants($request) {
 					array(
 						"type" => "resource",
 						"grants" => array('http://www.w3.org/ns/auth/acl#Write')
-					),
-					array(
-						"type" => "parent",
-						"grants" => array('http://www.w3.org/ns/auth/acl#Write')
 					)
 				);
 			break;