Correct venv3 detection on windows (#6490)
Correct venv3 detection on windows (#6490)

A little typo in the _venv_common.py block the script to finish correctly once the virtual environment has been setup on Windows.

This PR fixes that.
lmcro/letsencrypt,letsencrypt/letsencrypt,stweil/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt,letsencrypt/letsencrypt