Update Save-AzureRMVHD

[marherna]

The resource group is for a storage account not the Virtual machine

Description

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[msftclas]

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. We will now review your pull request.
Thanks,
Microsoft Pull Request Bot

[azuresdkci]

Can one of the admins verify this patch?

[cormacpayne]

@azuresdkci add to whitelist

[cormacpayne]

@marherna thanks for the update!