Bug fix on readonly property

[solankisamir]

One of the properties was not read-only. Making the fix, so the client can be updated with the appropriate changes.

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[azuresdkci]

Can one of the admins verify this patch?

[AutorestCI]

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The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#3106

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Azure/azure-sdk-for-ruby#1396

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Azure/azure-sdk-for-go#2424

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Azure/azure-sdk-for-node#3310