Enhance - Convert more messages (#2646)

convert more messages to messages class
skipped dashboard messages due to them relying on $_SESSION['message']
to know if there has already been a change

app/ring_groups/ring_group_destination_delete.php

@@ -55,7 +55,7 @@ else {
 	}
 
 //save the message to a session variable
-	$_SESSION['message'] = $text['message-delete'];
+	messages::add($text['message-delete']);
 
 //redirect the browser
 	header("Location: ring_group_edit.php?id=$ring_group_uuid");