bpo-34120: fix IDLE freezing after closing dialogs (GH-8603)


Added missing .grab_release() calls to all places where we call .grab_set().
(cherry picked from commit 10ea9409ceb5da83cb380b610750551e26561044)

Co-authored-by: Tal Einat <taleinat+github@gmail.com>
diff --git a/Lib/idlelib/help_about.py b/Lib/idlelib/help_about.py
index 2a274a9..64b13ac 100644
--- a/Lib/idlelib/help_about.py
+++ b/Lib/idlelib/help_about.py
@@ -195,6 +195,7 @@
 
     def ok(self, event=None):
         "Dismiss help_about dialog."
+        self.grab_release()
         self.destroy()