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IDLE: Simplify DynOptionsMenu __init__code (GH-101371)

Refactor DynOptionMenu's initializer to not copy  kwargs dict and use subscripting;
improve its htest.

(cherry picked from commit c41af812c948ec3cb07b2ef7a46a238f5cab3dc2)

Co-authored-by: JosephSBoyle <48555120+JosephSBoyle@users.noreply.github.com>
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
M
Miss Islington (bot) committed
2701a49df2a4ce3284f500bf8ababb172216f8cc
Parent: ca1cc14
Committed by GitHub <noreply@github.com> on 2/28/2023, 6:36:34 AM