fix build_type key exists check

[tatsuya-ogawa]

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Relates OR Closes #0000

Output from acceptance testing:

$  make testacc TESTARGS='-run=TestAccAWSCodeBuildWebhook_BuildType'                                      
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSCodeBuildWebhook_BuildType -timeout 180m
=== RUN   TestAccAWSCodeBuildWebhook_BuildType
=== PAUSE TestAccAWSCodeBuildWebhook_BuildType
=== CONT  TestAccAWSCodeBuildWebhook_BuildType
--- PASS: TestAccAWSCodeBuildWebhook_BuildType (96.21s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       97.836s

Related #20480 (comment)

[ewbankkit]

LGTM 🚀.

% AWS_CODEBUILD_GITHUB_SOURCE_LOCATION=... make testacc TESTARGS='-run=TestAccAWSCodeBuildWebhook_GitHub\|TestAccAWSCodeBuildWebhook_BuildType'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSCodeBuildWebhook_GitHub\|TestAccAWSCodeBuildWebhook_BuildType -timeout 180m
=== RUN   TestAccAWSCodeBuildWebhook_GitHub
=== PAUSE TestAccAWSCodeBuildWebhook_GitHub
=== RUN   TestAccAWSCodeBuildWebhook_BuildType
=== PAUSE TestAccAWSCodeBuildWebhook_BuildType
=== CONT  TestAccAWSCodeBuildWebhook_GitHub
=== CONT  TestAccAWSCodeBuildWebhook_BuildType
--- PASS: TestAccAWSCodeBuildWebhook_GitHub (28.65s)
--- PASS: TestAccAWSCodeBuildWebhook_BuildType (49.20s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       52.356s

[ewbankkit]

@tatsuya-ogawa Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v3.56.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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