[metric_logging][wandb] Fix wandb metric logger config save path (#2196)

torchtune/training/metric_logging.py

@@ -222,7 +222,7 @@ def log_config(self, config: DictConfig) -> None:
             try:
                 output_config_fname = Path(
                     os.path.join(
-                        config.checkpointer.checkpoint_dir,
+                        config.output_dir,
                         "torchtune_config.yaml",
                     )
                 )