message: Move client back to using MVFST by default.
  Summary: After the push is complete the next push we should be able to use MVFST again.
diff: @@ -49,7 +49,7 @@ struct QuicClientConnectionState : public QuicConnectionStateBase {
  // TODO: this is wrong, it should be the handshake finish time. But i need
  // a relatively sane time now to make the timestamps all sane.
  connectionTime = Clock::now();
  - originalVersion = QuicVersion::MVFST_OLD;
  + originalVersion = QuicVersion::MVFST;
  clientHandshakeLayer = new ClientHandshake(*cryptoState);
  handshakeLayer.reset(clientHandshakeLayer);
  // We shouldn't normally need to set this until we're starting the
  