Update Gradio_UI.py

Gradio_UI.py

@@ -194,7 +194,7 @@ class GradioUI:
     """A one-line interface to launch your agent in Gradio"""
 
     def __init__(self, agent: MultiStepAgent, file_upload_folder: str | None = None):
-         if not _is_package_available("gradio"):
+        if not _is_package_available("gradio"):
             raise ModuleNotFoundError(
                 "Please install 'gradio' extra to use the GradioUI: `pip install 'smolagents[gradio]'`"
             )