bpo-46630: Fix initial focus of IDLE query dialogs (GH-31112)

On Windows, one had to Tab or click on the entry box
to get a cursor and be able to enter anything.
(cherry picked from commit d1df81a730499cc6286d02afa6028a1e9c22bbbf)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>