tests: accept slightly different zip file in Python 3
I added some `unzip -t` here and I *think* the only change is from
Python 3 having more data in the zip file headers or something. Sigh.
Differential Revision: https://phab.mercurial-scm.org/D5075
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.