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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 16f91d87ff39 by Martin v. Löwis in branch 'default':
Issue #20568: Fix typo in pip option.
http://hg.python.org/cpython/rev/16f91d87ff39

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