Fix /~https://github.com/hashicorp/terraform-provider-google/issues/18085

[rainshen49]

Fixes hashicorp/terraform-provider-google#18085

The backend is returning non-empty default settings.

Release Note Template for Downstream PRs (will be copied)

identityplatform: fixed the planning diff when `sms_region_config` is not set.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 1 insertion(+))
google-beta provider: Diff ( 1 file changed, 1 insertion(+))

[modular-magician]

Tests analytics

Total tests: 28
Passed tests: 14
Skipped tests: 2
Affected tests: 0

Click here to see the affected service packages

• identityplatform

$\textcolor{green}{\textsf{All tests passed!}}$

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[github-actions]

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