[ticket/17489] Further queue logic adjustments

Saving queue is not needed if use_queue flag is set to false
as in this case the message should be set immediately in the runtime.

PHPBB-17487
PHPBB-17489

phpBB/includes/ucp/ucp_resend.php

@@ -157,9 +157,6 @@ class ucp_resend
 							]);
 
 							$messenger_method->send();
-
-							// Save the queue in the messenger method class (has to be called or these messages could be lost)
-							$messenger_method->save_queue();
 						}
 					}
 				}