Revert "minor LGTM fixes"

This reverts commit f10c2eff7d.

common/spinner.py

@@ -40,7 +40,7 @@ class Spinner():
     self.close()
 
 
-class FakeSpinner():
+class FakeSpinner(Spinner):
   def __init__(self):
     pass
 

common/text_window.py

@@ -43,7 +43,7 @@ class TextWindow():
     self.close()
 
 
-class FakeTextWindow():
+class FakeTextWindow(TextWindow):
   def __init__(self, s):
     pass