fix: update incorrect KMS validation logic

[ocofaigh]

Description

update incorrect KMS validation logic

Types of changes in this PR

Changes that affect the core Terraform module or submodules

• Bug fix
• New feature
• Dependency update

Changes that don't affect the core Terraform module or submodules

• Examples or tests (addition or updates of examples or tests)
• Documentation update
• CI-related update (pipeline, etc.)
• Other

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Release notes content

fix: update incorrect KMS validation logic

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Checklist for reviewers

• If relevant, a test for the change is included or updated with this PR.
• If relevant, documentation for the change is included or updated with this PR.

Merge actions for mergers

• Use a relevant conventional commit message that is based on the PR contents and any release notes provided by the PR author. The commit message determines whether a new version of the module is needed, and if so, which semver increment to use (major, minor, or patch).
• Merge by using "Squash and merge".

[ocofaigh]

@jor2 The pipelines comments have not been rolled out yet. Github is having an outage so pipeline is not triggering (https://www.githubstatus.com/)

[ocofaigh]

Test failed with what looks like backend IAM issue:

Error: [ERROR] Error retrieving resource group: An error occurred while performing the 'authenticate' step: Post "https://iam.cloud.ibm.com/identity/token": net/http: TLS handshake timeout null

Re-triggering the pipeline.

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.0.1 🎉

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