message: fix getting a realm coordinator
diff: @@ -177,7 +177,7 @@ void GlobalNotifier::register_realm(const std::string& path) {
  auto coordinator = _impl::RealmCoordinator::get_coordinator(config);
  m_listen_entries[path] = coordinator;
  - auto realm = Realm::make_shared_realm(std::move(config));
  + auto realm = coordinator->get_realm(std::move(config));
  if (realm->read_group().is_empty())
  realm = nullptr;
  