SPTrustedRootAuthority - Fix Error while adding Trusted Root Authority via CertificateThumbprint

[hollanjs]

Pull Request (PR) description

Added -Recurse to Get-ChildItem when Set-TargetResource attempts to obtain reference to the certificate by thumbprint.

This Pull Request (PR) fixes the following issues

• Fixes #1417

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Resource documentation added/updated in README.md.
• [ ] Resource parameter descriptions added/updated in README.md, schema.mof and comment-based help.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[hollanjs]

I've submitted an issue with the CertificateDsc module to move the Find-Certificate function to the DSCResource.Common module. This should allow a better refactoring of the SP resources that need to obtain references to certificates in the local machine, as well as reduce the amount of code and tests that need to be maintained and updated here.

[codecov[bot]]

Codecov Report

Merging #1418 (c4cf42f) into master (e294818) will increase coverage by 0%. The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1418   +/-   ##
======================================
  Coverage      84%     84%           
======================================
  Files         145     145           
  Lines       22645   22645           
======================================
+ Hits        19074   19076    +2     
+ Misses       3571    3569    -2     

Impacted Files	Coverage Δ
...stedRootAuthority/MSFT_SPTrustedRootAuthority.psm1	88% <100%> (ø)
...s/MSFT_SPInstallPrereqs/MSFT_SPInstallPrereqs.psm1	88% <0%> (+<1%)	:arrow_up: