[3.10] bpo-44254: On Mac, remove disfunctional colors from turtledemo buttons (GH-26448) #26449
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On macOS, tk defers to system setting for button background when in normal state.
Give turtledemo button text a color that works on either light or dark background.
(cherry picked from commit af5a324)
Co-authored-by: Terry Jan Reedy tjreedy@udel.edu
https://bugs.python.org/issue44254