fix http code for dir

Signed-off-by: changlin.shi <changlin.shi@ly.com>

weed/s3api/s3acl/acl_helper.go

@@ -507,8 +507,7 @@ func GrantEquals(a, b *s3.Grant) bool {
 
 func CheckObjectAccessForReadObject(r *http.Request, w http.ResponseWriter, entry *filer.Entry, bucketOwnerId string) (statusCode int, ok bool) {
 	if entry.IsDirectory() {
-		w.Header().Set(s3_constants.X_SeaweedFS_Header_Directory_Key, "true")
-		return http.StatusMethodNotAllowed, false
+		return http.StatusOK, true
 	}
 
 	accountId := GetAccountId(r)