bpo-33975: Avoid small type when running IDLE's htests. (GH-7944)

Import pyshell first in htest to call SetProcessDpiAwareness on Windows
before tkinter.Tk() is called for the htest. Apparently, 'root.destroy()'
undoes a previous 'root = Tk()'. Since IDLE unittests always destroy roots,
a unittest before an htest does not require anything more to work right.
Since part of the purpose of human-viewed tests is to determine that
widgets look right, it is important that they look the same for testing
as when running IDLE.
(cherry picked from commit 3c8043d8fac4c0d05c0ba9e4e555e2f3165f2fe0)

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

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