[Observium] One line change to make Teams notifications look good on phone

Hi,

adding a summary line/item makes Teams notifications look so much better in lists/phone:

Index: includes/alerting/teams.inc.php =================================================================== --- includes/alerting/teams.inc.php    (revision 9590) +++ includes/alerting/teams.inc.php    (working copy) @@ -19,6 +19,7 @@  // JSON data  $data_string = json_encode(array(    'title' => $message_tags['TITLE'], +  'summary' => $message_tags['TITLE'],    'text' => ' ',    'sections' => array(      array(