fixes subscription ID while validating image

[shubangmck]

If your PR resolves any open issue(s), please indicate them like this so they will be closed when your PR is merged:

Closes #472

[hashicorp-cla-app]

All committers have signed the CLA.

[hashicorp-cla-app]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

Learn more about why HashiCorp requires a CLA and what the CLA includes

---

shubangmck seems not to be a GitHub user.
You need a GitHub account to be able to sign the CLA.
If you have already a GitHub account, please add the email address used for this commit to your account.

_{Have you signed the CLA already but the status is still pending? Recheck it.}

[JenGoldstrich]

Hey @shubangmck thanks for this contribution, I notice another instance where we're setting the subscription ID from the az cli's subscription.

This change makes sense but on line 106 we query the Image after querying the Image Version ID, so wouldn't you also need to also override the subscription ID there to fix your issue?

[shubangmck]

@JenGoldstrich Just updated my code, thanks for pointing it out!