Fix cxx printing for Min/Max

[FFroehlich]

References to other Issues or PRs

Fixes #20557

Brief description of what is fixed or changed

Previous implementation used string conversion for first argument. Fixed correctly using using codeprinting

Other comments

Release Notes

• printing
  • make cxxcode correctly print the first argument of Min/Max functions

[sympy-bot]

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• printing
  • make cxxcode correctly print the first argument of Min/Max functions (#20558 by @FFroehlich)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.8.

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<!-- Your title above should be a short description of what
was changed. Do not include the issue number in the title. -->

#### References to other Issues or PRs
Fixes #20557 

#### Brief description of what is fixed or changed
Previous implementation used string conversion for first argument. Fixed correctly using using codeprinting

#### Other comments


#### Release Notes

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https://github.com/sympy/sympy/wiki/Writing-Release-Notes for more information
on how to write release notes. The bot will check your release notes
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<!-- BEGIN RELEASE NOTES -->
* printing
  * make cxxcode correctly print the first argument of Min/Max functions
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[czgdp1807]

Thanks for sending the fix @FFroehlich . If possible, could you please add a regression test for this fix?

[bjodah]

Looks good, thank you for the patch. I concur, a test would be nice. Otherwise, +1 from me.

[codecov]

Codecov Report

Merging #20558 (636474d) into master (425353e) will decrease coverage by 0.005%.
The diff coverage is 100.000%.

@@              Coverage Diff              @@
##            master    #20558       +/-   ##
=============================================
- Coverage   75.742%   75.737%   -0.006%     
=============================================
  Files          673       673               
  Lines       174499    174499               
  Branches     41205     41205               
=============================================
- Hits        132170    132161        -9     
- Misses       36607     36611        +4     
- Partials      5722      5727        +5     

[FFroehlich]

@bjodah @czgdp1807 added regression tests

[czgdp1807]

Tests are passing. Will merge tomorrow if no objections raised. Thanks for the contributions.