Fix a broken test in test_traceback where the module name was being tacked on

needlessly.

Lib/test/test_traceback.py

@@ -118,9 +118,7 @@ def test():
         err = traceback.format_exception_only(X, X())
         self.assertEqual(len(err), 1)
         str_value = '<unprintable %s object>' % X.__name__
-        self.assertEqual(err[0], "%s.%s: %s\n" % (X.__module__,
-                                                  X.__name__,
-                                                  str_value))
+        self.assertEqual(err[0], "%s: %s\n" % ( X.__name__, str_value))
 
     def test_without_exception(self):
         err = traceback.format_exception_only(None, None)