Fixup Trusted Signer certificate selection

[jborean93]

Fix the logic to select the proper Azure Trusted Signer certificate on Windows.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 6 lines in your changes missing coverage. Please review.

Project coverage is 62.94%. Comparing base (5eb1448) to head (a9e9e19).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/OpenAuthenticode/CertificateHelper.cs	75.00%	1 Missing and 4 partials ⚠️
...enticode.Module/OpenAuthenticodeAzTrustedSigner.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   60.39%   62.94%   +2.54%     
==========================================
  Files          24       25       +1     
  Lines        1462     1989     +527     
  Branches      198      205       +7     
==========================================
+ Hits          883     1252     +369     
- Misses        520      671     +151     
- Partials       59       66       +7     

Flag	Coverage Δ
PS_7.4_x64_Linux	62.84% <78.78%> (+2.44%)	⬆️
PS_7.4_x64_Windows	62.74% <78.78%> (+2.34%)	⬆️

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