r/aws_cloudfront_cache_policy: Fix support for 0 values of default_ttl, max_ttl and min_ttl

[ewbankkit]

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Closes #21788.

Output from acceptance testing:

% make testacc PKG_NAME=internal/service/cloudfront TESTARGS='-run=TestAccCloudFrontCachePolicy_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudfront/... -v -count 1 -parallel 20 -run=TestAccCloudFrontCachePolicy_ -timeout 180m
=== RUN   TestAccCloudFrontCachePolicy_basic
=== PAUSE TestAccCloudFrontCachePolicy_basic
=== RUN   TestAccCloudFrontCachePolicy_disappears
=== PAUSE TestAccCloudFrontCachePolicy_disappears
=== RUN   TestAccCloudFrontCachePolicy_Items
=== PAUSE TestAccCloudFrontCachePolicy_Items
=== RUN   TestAccCloudFrontCachePolicy_ZeroTTLs
=== PAUSE TestAccCloudFrontCachePolicy_ZeroTTLs
=== CONT  TestAccCloudFrontCachePolicy_basic
=== CONT  TestAccCloudFrontCachePolicy_ZeroTTLs
=== CONT  TestAccCloudFrontCachePolicy_Items
=== CONT  TestAccCloudFrontCachePolicy_disappears
--- PASS: TestAccCloudFrontCachePolicy_disappears (11.20s)
--- PASS: TestAccCloudFrontCachePolicy_ZeroTTLs (15.62s)
--- PASS: TestAccCloudFrontCachePolicy_basic (15.67s)
--- PASS: TestAccCloudFrontCachePolicy_Items (22.51s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/cloudfront	26.090s

[zhelding]

LGTM! 🚀

[github-actions]

This functionality has been released in v3.66.0 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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