Fix tests with v2.34.1

[andrjohns]

Submission Checklist

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

Summary

Updating argument tests to account for changes in stan-dev/cmdstan#1243

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 (fb85ee1) 86.65% compared to head (5f806f7) 86.65%.
Report is 2 commits behind head on master.

❗ Current head 5f806f7 differs from pull request most recent head 0b9d795. Consider uploading reports for the commit 0b9d795 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #910   +/-   ##
=======================================
  Coverage   86.65%   86.65%           
=======================================
  Files          12       12           
  Lines        4534     4534           
=======================================
  Hits         3929     3929           
  Misses        605      605           

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[jgabry]

Thanks! I was about to look into this today