mediastore/container_policy: Fix equivalent policy diffs

[YakDriver]

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Relates #21968

Output from acceptance testing:

% make testacc TESTS=TestAccMediaStoreContainerPolicy_basic PKG=mediastore
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/mediastore/... -v -count 1 -parallel 20 -run='TestAccMediaStoreContainerPolicy_basic' -timeout 180m
--- PASS: TestAccMediaStoreContainerPolicy_basic (108.37s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/mediastore	110.044s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccMediaStoreContainerPolicy_ PKG=mediastore
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/mediastore/... -v -count 1 -parallel 20 -run='TestAccMediaStoreContainerPolicy_' -timeout 180m
=== RUN   TestAccMediaStoreContainerPolicy_basic
=== PAUSE TestAccMediaStoreContainerPolicy_basic
=== CONT  TestAccMediaStoreContainerPolicy_basic
--- PASS: TestAccMediaStoreContainerPolicy_basic (111.32s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/mediastore	116.387s

[github-actions]

This functionality has been released in v3.70.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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