Update gradio_demo.py

gradio_demo.py

@@ -1372,7 +1372,7 @@ with block:
                 
         #         return composite
 
-       class BackgroundManager:
+        class BackgroundManager:
             def __init__(self, mask_mover):
                 self.original_bg = None  # To store the original background
                 self.current_bg = None  # Store current background