Fix test failures under cmdstan 2.34

[andrjohns]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

Fix test failures under cmdstan 2.34

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):
Andrew Johnson

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)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d444e7f) 88.37% compared to head (68e504d) 88.28%.
Report is 6 commits behind head on master.

❗ Current head 68e504d differs from pull request most recent head 03b5cbb. Consider uploading reports for the commit 03b5cbb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #905      +/-   ##
==========================================
- Coverage   88.37%   88.28%   -0.10%     
==========================================
  Files          12       12              
  Lines        4535     4534       -1     
==========================================
- Hits         4008     4003       -5     
- Misses        527      531       +4     

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[jgabry]

Thanks!