xADOrganizationalUnit: Verbose Message Fix

[X-Guardian]

Pull Request (PR) description

This PR fixes the incorrect verbose message when this resource has Ensure set to Absent.

This Pull Request (PR) fixes the following issues

• Fixes xADOrganizationalUnit: Test-TargetResource showing wrong verbose message #276

Task list

• Added an entry under the Unreleased section in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in resource directory README.md.
• Resource parameter descriptions added/updated in 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 Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #396 into dev will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff         @@
##            dev   #396   +/-   ##
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  Coverage    92%    92%           
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  Files        20     20           
  Lines      2538   2538           
  Branches     10     10           
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  Hits       2345   2345           
  Misses      183    183           
  Partials     10     10

[johlju]

Reviewed 3 of 3 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved