[issue42789] Do not skip test_curses on non-tty

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Buildbot failure: ARM Raspbian 3.x: (...)

As expected, the 3.8 and 3.9 change also broke 11 buildbots (3.8 and 3.8) ;-) I understand that bpo-42681 will fix buildbots.

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