Fixed type errors in 'RemoteDesktopCollections' and 'RemoteDesktopDeployment'

[raandree]

Pull Request

Pester tests failed for 'RemoteDesktopCollections' and 'RemoteDesktopDeploymentMade'. 'SessionHost' defined as an array but is a scalar in the underlying DSC resources.

Pull Request (PR) description

Fixed

• SessionHost is now a scalar in 'RemoteDesktopCollections' and 'RemoteDesktopDeploymentMade'.

Task list

• The PR represents a single logical change. i.e. Cosmetic updates should go in different PRs.
• Added an entry under the Unreleased section of in the CHANGELOG.md as per format.
• Local clean build passes without issue or fail tests (build.ps1 -ResolveDependency).
• 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 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 

[nyanhp]

Future release of RemoteDesktop DSC resources will support a list of session hosts. I'll convert this PR to a draft until that happens