message: Fix lookup key for connection timeout
diff: @@ -112,7 +112,8 @@ behavior basp_broker::make_behavior() {
  CAF_LOG_DEBUG("enable heartbeat" << CAF_ARG(heartbeat_interval));
  auto now = clock().now();
  auto first_tick = now + heartbeat_interval;
  - auto connection_timeout = get_or(config(), "middleman.connection-timeout",
  + auto connection_timeout = get_or(config(),
  + "caf.middleman.connection-timeout",
  defaults::middleman::connection_timeout);
  // Note: we send the scheduled time as integer representation to avoid
  // having to assign a type ID to the time_point type.
  