[qa] Avoid mypy crash

tests/test_image_utils.py

@@ -6,9 +6,8 @@
 import numpy
 import PIL.Image
 
-from ptbench.data.image_utils import (
+from ptbench.data.image_utils import (  # SingleAutoLevel16to8,
     RemoveBlackBorders,
-    SingleAutoLevel16to8,
     load_pil,
 )