CLEANUP: listener: Remove useless task_queue from manage_global_listener_queue

At the end of manage_global_listener_queue(), the task expire date is set to
TICK_ETERNITY. Thus, it is useless to call task_queue() just after because
the function does nothing in this case.
diff --git a/src/listener.c b/src/listener.c
index 33a1a99..6cd365a 100644
--- a/src/listener.c
+++ b/src/listener.c
@@ -1301,7 +1301,6 @@
 	HA_RWLOCK_WRLOCK(LISTENER_LOCK, &global_listener_rwlock);
 	t->expire = TICK_ETERNITY;
 	HA_RWLOCK_WRUNLOCK(LISTENER_LOCK, &global_listener_rwlock);
-	task_queue(t);
 	return t;
 }