bpo-30722: Make redemo work with Python 3.6+ (GH-2311)

diff --git a/Tools/demo/redemo.py b/Tools/demo/redemo.py
index 8335d4c..256a63e 100755
--- a/Tools/demo/redemo.py
+++ b/Tools/demo/redemo.py
@@ -75,7 +75,6 @@
         self.boxes = []
         self.vars = []
         for name in ('IGNORECASE',
-                     'LOCALE',
                      'MULTILINE',
                      'DOTALL',
                      'VERBOSE'):
@@ -83,7 +82,7 @@
                 frame = Frame(self.master)
                 frame.pack(fill=X)
                 self.frames.append(frame)
-            val = getattr(re, name)
+            val = getattr(re, name).value
             var = IntVar()
             box = Checkbutton(frame,
                     variable=var, text=name,