fix: added fix to use basename of kms config

[manojburi-google2]

Changes are inline with https://github.com/GoogleCloudPlatform/magic-modules/pull/12418/files#

Description

Fixes #

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Checklist

Readiness

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

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• My sample follows the other requirements and best practices in the Contributing
  guide

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

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  Reason:

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[glasnt]

/gcbrun