tests: glob over some timing numbers in test-shelve.t
The Windows bot is slow enough that it was 2s in the first hunk.
Differential Revision: https://phab.mercurial-scm.org/D6663
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.