message: fix missing initialization of input.sym
diff: @@ -78,6 +78,7 @@ void GtpClient::Run() {
  Model::Output output;
  Model::Input input;
  input.to_play = Color::kBlack;
  + input.sym = symmetry::kIdentity;
  input.position_history.push_back(&stones);
  std::vector<const Model::Input*> inputs = {&input};
  std::vector<Model::Output*> outputs = {&output};
  