resource/aws_kinesis_firehose_delivery_stream_test: Fixed ExternalId being a random int

[Ninir]

This fixes a bug where the ExternalId for a policy was a random int passed rather than the actual account id.

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSKinesisFirehoseDeliveryStream_s3KinesisStreamSource'          
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSKinesisFirehoseDeliveryStream_s3KinesisStreamSource -timeout 120m
=== RUN   TestAccAWSKinesisFirehoseDeliveryStream_s3KinesisStreamSource
--- PASS: TestAccAWSKinesisFirehoseDeliveryStream_s3KinesisStreamSource (145.14s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	145.179s

[radeksimko]

Good catch, I somehow missed that - thanks!

[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!