fix(clapi) export contact with contact group (#6131)

www/class/centreon-clapi/centreonContactGroup.class.php

@@ -234,7 +234,7 @@ class CentreonContactGroup extends CentreonObject
             'AND'
         );
         foreach ($elements as $element) {
-            $this->api->export_filter('CONTACT', $element['contact_id'], $element[$cgFieldName]);
+            $this->api->export_filter('CONTACT', $element['contact_id'], $element['contact_alias']);
             echo $this->action . $this->delim . "addcontact" .
                 $this->delim . $element[$cgFieldName] . $this->delim . $element[$cFieldName] .
                 $this->delim . $element['contact_alias'] . "\n";