Revert "Mail: Hide BCC in internal messages"

This reverts commit 6a6d473.

Author: mjansenDatabay

Services/Mail/classes/class.ilMail.php

@@ -739,7 +739,7 @@ private function sendChanneledMails(
                 $this->user_id,
                 $mail_data->getAttachments(),
                 $mail_data->getTo(),
-                '',
+                $mail_data->getCc(),
                 '',
                 'unread',
                 $mail_data->getSubject(),