fix atari record

src/backend.py

@@ -461,6 +461,8 @@ def evaluate(
                     if episode_infos is not None:
                         logger.info(f"Atari Episode Score: {episode_infos['r']:.2f}")
                         logger.info("Atari Episode Length", episode_infos["l"])
+                        episode_rewards.append(episode_infos["r"])
+                        episode_lengths.append(episode_infos["l"])
 
                 if done and not is_atari and verbose > 0:
                     # NOTE: for env using VecNormalize, the mean reward