message: fix initial cwnd experiment
  Summary: Perf testing.
diff: @@ -793,29 +793,24 @@ void QuicServerWorker::dispatchPacketData(
  if (statsCallback_) {
  trans->setTransportStatsCallback(statsCallback_.get());
  }
  - if (quicVersion == QuicVersion::MVFST_EXPERIMENTAL) {
  - transportSettings_.initCwndInMss = 20;
  - }
  - auto overridenTransportSettings = transportSettingsOverrideFn_
  + auto transportSettings = transportSettingsOverrideFn_
  ? transportSettingsOverrideFn_(
  transportSettings_, client.getIPAddress())
  - : folly::none;
  -
  - if (overridenTransportSettings) {
  - if (overridenTransportSettings->dataPathType !=
  - transportSettings_.dataPathType) {
  - // It's too complex to support that.
  - LOG(ERROR)
  + .value_or(transportSettings_)
  + : transportSettings_;
  + LOG_IF(
  + ERROR,
  + transportSettings.dataPathType != transportSettings_.dataPathType)
  << "Overriding DataPathType isn't supported. Requested datapath="
  - << (overridenTransportSettings->dataPathType ==
  + << (transportSettings.dataPathType ==
  DataPathType::ContinuousMemory
  ? "ContinuousMemory"
  : "ChainedMemory");
  + // TODO T132636939: remove after experimenting w/ higher init cwnd.
  + if (quicVersion == QuicVersion::MVFST_EXPERIMENTAL) {
  + transportSettings.initCwndInMss = 20;
  }
  - trans->setTransportSettings(*overridenTransportSettings);
  - } else {
  - trans->setTransportSettings(transportSettings_);
  - }
  + trans->setTransportSettings(transportSettings);
  trans->setConnectionIdAlgo(connIdAlgo_.get());
  trans->setServerConnectionIdRejector(this);
  if (routingData.sourceConnId) {
  