Merge branch '6656-spamfilter-white-blacklist-entries-can-not-be-added-by-the-client' into 'develop'

Resolve "Spamfilter white/blacklist entries can not be added by the client"

Closes #6656

See merge request ispconfig/ispconfig3!1869

Author: Till Brehm

interface/web/mail/mail_domain_edit.php

@@ -355,7 +355,7 @@ function onAfterInsert() {
 			// We create a new record
 			$insert_data = array(
 				"sys_userid" => $_SESSION["s"]["user"]["userid"],
-				"sys_groupid" => $tmp_domain["sys_groupid"],
+				"sys_groupid" => (isset($this->dataRecord["client_group_id"]))?$this->dataRecord["client_group_id"]:$tmp_domain["sys_groupid"],
 				"sys_perm_user" => 'riud',
 				"sys_perm_group" => 'riud',
 				"sys_perm_other" => '',