message: Fix bson argument handling in call_reset_password_function
diff: @@ -264,18 +264,21 @@ void App::UsernamePasswordProviderClient::call_reset_password_function(const std
  handle_default_response(response, completion_block);
  };
  - nlohmann::json body = {
  + bson::BsonDocument arg = {
  { "email", email },
  { "password", password },
  { "arguments", args }
  };
  + std::stringstream body;
  + body << bson::Bson(arg);
  +
  m_parent->m_config.transport_generator()->send_request_to_server({
  HttpMethod::post,
  route,
  m_parent->m_request_timeout_ms,
  get_request_headers(),
  - body.dump()
  + body.str()
  }, handler);
  }
  