Fixed ServerActiveDirectoryAdministratorTest

[j82w]

Removed a check for the graph endpoint when setting the Azure SQL Server Active Directory administrator that caused the test to fail.

[azurecla]

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[akromm-zz]

Looks good to me.

[azurecla]

Hi @j82w, I'm your friendly neighborhood Azure Pull Request Bot (You can call me AZPRBOT). Thanks for your contribution!

It looks like you're working at Microsoft (jawilley). If you're full-time, we DON'T require a contribution license agreement.

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[markcowl]

Is this a safe change? Do you need the graph endpoint in one of your clients?

[j82w]

I added the check back in with the latest commit, and set the graph endpoint in the test framework.