Update tests for new cmdstan defaults

[WardBrian]

trafficstars

Submission Checklist

• [x] Run unit tests
• [x] Declare copyright holder and open-source license: see below

Summary

Test changes needed for 2.37: https://github.com/stan-dev/cmdstan/issues/1324

Note that no logic needs to change for this version, just some hardcoded values in our tests.

Copyright and Licensing

Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):

Simons Foundation

By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)