Fixes to sig-fix command

[daidoji]

Fixes #430

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.71%. Comparing base (9e24615) to head (9adda34).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/keria/app/cli/commands/sig-fix.py	0.00%	4 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #431      +/-   ##
==========================================
- Coverage   87.74%   87.71%   -0.04%     
==========================================
  Files          26       26              
  Lines        5808     5810       +2     
==========================================
  Hits         5096     5096              
- Misses        712      714       +2     

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[iFergal]

(I think we can ignore the codecov in this case)