Fix TestAccApiGatewayGateway_apigatewayGatewayBasicExampleUpdated (beta)

[melinath]

Test failure:

Error: Error waiting for Deleting ApiConfig: Error code 9, message: Delete API Config Row: config is in use in us-central1: [tf-test-api-gwyknboj6v23]

Example: https://ci-oss.hashicorp.engineering/buildConfiguration/GoogleCloudBeta_ProviderGoogleCloudBetaGoogleProject/176077?buildTab=tests&expandedTest=-6725046900877211087

[melinath]

Possibly due to GoogleCloudPlatform/magic-modules#4557

[melinath]

Confirmed that reverting that PR fixed the test failure.

[ghost]

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