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

[mental]

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

Brett, Vinay: mind if I handle this one? I'm looking for a good first issue to tackle.

In terms of solutions I propose adding short circuiting logic to the checks for custom prompts to test against the default case `({context.env_name})`

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nosy: +mental

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