fix(compute): Changed the service account scope in the sample

[sjimmy01]

Changed the service account scope in the sample.

Description

Fixes #

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Checklist

Readiness

• [x] Yes, merge this PR after it is approved
• [ ] No, don't merge this PR after it is approved

Style

• [ ] My sample follows the rules described for Terraform in the Effective Samples style guide
• [ ] My sample follows the other requirements and best practices in the Contributing guide

Testing

• [ ] I have performed tests described in the Contributing guide:

  • [ ] Tests pass: terraform apply
  • [ ] Lint pass: terraform fmt check

Intended location

• [x] Yes, this sample will be (or already is) included on cloud.google.com Location(s):

• [ ] No, this sample won't be included on cloud.google.com Reason:

API enablement

• [ ] If the sample needs an API enabled to pass testing, I have added the service to the Test setup file

Review

• [ ] If this sample adds a new directory, I have added codeowners to the CODEOWNERS file

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[sjimmy01]

/assign askubis

[sjimmy01]

/assign msampathkumar

[msampathkumar]

/gcbrun