message: Fix use after free in unit test
diff: @@ -123,7 +123,7 @@ void check_order_event_based_actor(const check_order_t& corder) {
  auto seq_it = sequence.cbegin();
  {
  auto tmp = system.spawn(
  - [=](event_based_actor* self) mutable {
  + [&](event_based_actor* self) {
  self->set_default_handler(skip);
  for(auto i : send_order) {
  self->send(self, i);
  