tests/resource/aws_s3_bucket_policy: Fix expected policy with data-source/aws_iam_policy_document wildcard handling

[bflad]

Followup to #4248

Changes proposed in this pull request:

• Adjust testing expected policy content for change in Remove principal type AWS from IAM policy wildcard normalization #4248 (details in CHANGELOG)

Previously:

=== RUN   TestAccAWSS3BucketPolicy_basic
--- FAIL: TestAccAWSS3BucketPolicy_basic (21.16s)
    testing.go:518: Step 0 error: Check failed: Check 2/2 error: Non-equivalent policy error:
        
        expected: {"Version":"2012-10-17","Statement":[{"Sid": "", "Effect":"Allow","Principal":"*","Action":"s3:*","Resource":["arn:aws:s3:::tf-test-bucket-4419237844750449962/*","arn:aws:s3:::tf-test-bucket-4419237844750449962"]}]}
        
             got: {"Version":"2012-10-17","Statement":[{"Sid":"","Effect":"Allow","Principal":{"AWS":"*"},"Action":"s3:*","Resource":["arn:aws:s3:::tf-test-bucket-4419237844750449962/*","arn:aws:s3:::tf-test-bucket-4419237844750449962"]}]}

=== RUN   TestAccAWSS3BucketPolicy_policyUpdate
--- FAIL: TestAccAWSS3BucketPolicy_policyUpdate (10.80s)
    testing.go:518: Step 0 error: Check failed: Check 2/2 error: Non-equivalent policy error:
        
        expected: {"Version":"2012-10-17","Statement":[{"Sid": "", "Effect":"Allow","Principal":"*","Action":"s3:*","Resource":["arn:aws:s3:::tf-test-bucket-7001005429761437413/*","arn:aws:s3:::tf-test-bucket-7001005429761437413"]}]}
        
             got: {"Version":"2012-10-17","Statement":[{"Sid":"","Effect":"Allow","Principal":{"AWS":"*"},"Action":"s3:*","Resource":["arn:aws:s3:::tf-test-bucket-7001005429761437413/*","arn:aws:s3:::tf-test-bucket-7001005429761437413"]}]}

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSS3BucketPolicy'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSS3BucketPolicy -timeout 120m
=== RUN   TestAccAWSS3BucketPolicy_basic
--- PASS: TestAccAWSS3BucketPolicy_basic (34.86s)
=== RUN   TestAccAWSS3BucketPolicy_policyUpdate
--- PASS: TestAccAWSS3BucketPolicy_policyUpdate (48.12s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	83.013s

[tombuildsstuff]

LGTM 👍

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!