[3.6] bpo-31500: Removed fixed size of IDLE config dialog. (GH-3664) (#3665)

This one line of Serhiy Storchacka's bpo-31500 patch for is needed for other issues.
(cherry picked from commit d6e2f26)

Author: miss-islington

Lib/idlelib/configdialog.py

@@ -105,7 +105,7 @@ def create_widgets(self):
             load_configs: Load pages except for extensions.
             activate_config_changes: Tell editors to reload.
         """
-        self.note = note = Notebook(self, width=450, height=450)
+        self.note = note = Notebook(self)
         self.highpage = HighPage(note)
         self.fontpage = FontPage(note, self.highpage)
         self.keyspage = KeysPage(note)