Fix export and set of phone numbers

[FabienTschanz]

Pull Request (PR) description

This PR fixes an issue in the AADUser resource where all of the properties with a phone number were not exported and set correctly.

This Pull Request (PR) fixes the following issues

• Fixes AADUser: Phone numbers missing? #4526

Task list

• 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 parameter descriptions added/updated in the schema.mof.
• Resource documentation added/updated in README.md.
• Resource settings.json file contains all required permissions.
• Examples appropriately added/updated.
• Unit tests added/updated.
• New/changed code adheres to DSC Community Style Guidelines.