Update flags.py (#6751)

fixes issue #6750

## Motivation for features / changes

I needed to debug in pycharm

## Technical description of changes

jsut updated the behavior so it appropriately recognized the keyword

## Screenshots of UI changes (or N/A)

## Detailed steps to verify changes work correctly (as executed by you)

## Alternate designs / implementations considered (or N/A)

tensorboard/compat/tensorflow_stub/flags.py

@@ -72,6 +72,8 @@ def __init__(self, flags_object):
     def __getattribute__(self, name):
         if name == "__dict__":
             return super().__getattribute__(name)
+        elif name == "__class__":
+            return super.__class__
         return self.__dict__["__wrapped"].__getattribute__(name)
 
     def __getattr__(self, name):