Fix: only over-write http_port when cli arg is passed

[sandreae]

📋 Checklist

• Add tests that cover your changes
• Add this PR to the Unreleased section in CHANGELOG.md
• Link this PR to any issues it closes
• New files contain a SPDX license header

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (d5ba55d) 91.95% compared to head (95034ff) 91.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
- Coverage   91.95%   91.94%   -0.02%     
==========================================
  Files         100      100              
  Lines       15914    15914              
==========================================
- Hits        14634    14632       -2     
- Misses       1280     1282       +2     

see 2 files with indirect coverage changes

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