feedback-manager: Dispose leds too

src/fbd-feedback-manager.c

@@ -388,6 +388,7 @@ fbd_feedback_manager_dispose (GObject *object)
   g_clear_object (&self->settings);
   g_clear_object (&self->theme);
   g_clear_object (&self->vibra);
+  g_clear_object (&self->leds);
   g_clear_object (&self->client);
   g_clear_pointer (&self->events, g_hash_table_destroy);