Internal: Message: Fix e-mail sender (if provided) - refs BT#20235

Also might affect other e-mail sending processes. Was using global platform sender setting before, no matter what.

public/main/inc/lib/notification.lib.php

@@ -318,8 +318,8 @@ class Notification extends Model
                                 $userInfo['mail'],
                                 Security::filter_terms($titleToNotification),
                                 Security::filter_terms($content),
-                                $this->adminName,
-                                $this->adminEmail,
+                                !empty($senderInfo['complete_name']) ? $senderInfo['complete_name'] : $this->adminName,
+                                !empty($senderInfo['email']) ? $senderInfo['email'] : $this->adminEmail,
                                 $extraHeaders,
                                 $attachments,
                                 false