Format option unwind-max analogously to the other options.

[mgudemann]

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.54% 🎉

Comparison is base (a021bf6) 78.47% compared to head (595da03) 79.01%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7910      +/-   ##
===========================================
+ Coverage    78.47%   79.01%   +0.54%     
===========================================
  Files         1697     1697              
  Lines       195369   195369              
===========================================
+ Hits        153307   154363    +1056     
+ Misses       42062    41006    -1056     

see 48 files with indirect coverage changes

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