refine default argument

app.py

@@ -53,7 +53,7 @@ def infer_func(img, do_rm_bkg=True, do_infer_aug=False):
 
 example_files = os.listdir('examples')
 example_files.sort()
-example_files = [[os.path.join('examples', filename), True, False] for filename in example_files]
+example_files = [[os.path.join('examples', filename), None, None] for filename in example_files]
 print(example_files)
 server = gr.Interface(
     flagging_mode='never',