[issue20568] Pass --default-install to ensurepip in the Windows installers

[Nick Coghlan]

Nick Coghlan added the comment:

This was still missing from rc2 - this is a *serious* usability issue on Windows and needs to be fixed before 3.4 final.

POSIX already has the python/python3 convention, so extending that to pip is reasonable. Windows has no such convention, and the "pip3" naming is just confusing there. We need to install "pip" as well.

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