[3.11] gh-88878: IDLE - replace type('') with str (#95792)

Change in idlelib.browser, line 54
cherrypicked from 3680ebe

Author: terryjreedy

Lib/idlelib/browser.py

@@ -52,7 +52,7 @@ def transform_children(child_dict, modname=None):
                 # If obj.name != key, it has already been suffixed.
                 supers = []
                 for sup in obj.super:
-                    if type(sup) is type(''):
+                    if isinstance(sup, str):
                         sname = sup
                     else:
                         sname = sup.name