Fix comparison of Scope field in PAS - RoleAssignment Resource

[AshishGargMicrosoft]

Description

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This checklist is used to make sure that common guidelines for a pull request are followed. You can find a more complete discussion of PowerShell cmdlet best practices here.

• I have read the contribution guidelines.
• If changes were made to any cmdlet, the XML help was regenerated using the platyPSHelp module.
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Testing Guidelines

• Pull request includes test coverage for the included changes.
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[msftclas]

All CLA requirements met.

[azuresdkci]

Can one of the admins verify this patch?

[cormacpayne]

@darshanhs90 Hey Haridarshan, would you mind signing off on this PR if everything looks good?

[AshishGargMicrosoft]

@cormacpayne - darshanhs90 is OOF till end of Oct. Is there anyone else who can approve this?

[cormacpayne]

@azuresdkci add to whitelist