Fix Call to undefined function isEgroup()

src/CERNLdapService.php

@@ -48,7 +48,7 @@ Class CERNLdapService {
         }
         $entries_visited["$member"] = "$member";
         //If e-group and flag enabled, recurse
-        if (isEgroup($member) && $recursive){
+        if ($this->isEgroup($member) && $recursive){
           $egroupName = $this->getEgroupNameFromDN($member);
           $this->resolveEgroup($egroupName, $list_emails, $entries_visited, $recursive);
           continue;