message: Fix app_name parameter value (lib)
diff: @@ -5460,9 +5460,12 @@ error Context::signupGoogle(
  ws["initial_pricing_plan"] = 0;
  user["workspace"] = ws;
  + std::stringstream ss;
  + ss << "/api/v9/signup?app_name=" << TogglClient::Config.AppName;
  +
  HTTPSRequest req;
  req.host = urls::API();
  - req.relative_url = "/api/v9/signup?app_name=kopsik";
  + req.relative_url = ss.str();
  req.payload = Json::StyledWriter().write(user);
  HTTPSResponse resp = toggl_client->Post(req);
  