[issue37661] venv activation scripts erroneously check if __VENV_PROMPT__ is defined

[mental]

mental <m3nta1 at yahoo.com> added the comment:

I've added a PR (#1492) since it was a simple fix.

Please feel free to reject if this issue is reserved or some other fatal issue with the solution is found.

Otherwise I'd love a review and a double check (mainly paranoia from not wanting to mess up).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37661>
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