Fixed cleanup with reuse existing

src/backend/run_eval_suite_lighteval.py

@@ -69,7 +69,7 @@ def run_evaluation(eval_request: EvalRequest, task_names: str, batch_size: int,
         import traceback
         traceback.print_exception(ex)
         env_config = EnvConfig(token=TOKEN, cache_dir=args.cache_dir)
-        args.reuse_existing = True
+        args.model_config['model']['base_params']['reuse_existing'] = True
         model_config = create_model_config(args=args, accelerator=accelerator)
         model, _ = load_model(config=model_config, env_config=env_config)
         model.cleanup()