Set default value to None for --image_max_width during prediction

dan/predict/__init__.py

@@ -68,7 +68,7 @@ def add_predict_parser(subcommands) -> None:
     parser.add_argument(
         "--image-max-width",
         type=int,
-        default=1800,
+        default=None,
         required=False,
         help="Image resizing before feeding it to DAN",
     )