CCM-15020: SNS permissions tweak

Author: gareth-allan

infrastructure/terraform/components/dl/sns_topic.tf

@@ -13,11 +13,8 @@ data "aws_iam_policy_document" "sns_topic_policy_document" {
     effect = "Allow"
 
     principals {
-      type = "AWS"
-      identifiers = [
-        "arn:aws:iam::${var.shared_infra_account_id}:role/nhs-*-events-digital-letters-reporting",
-        "arn:aws:sts::${var.shared_infra_account_id}:assumed-role/nhs-*-events-digital-letters-reporting/*"
-      ]
+      type        = "AWS"
+      identifiers = [var.shared_infra_account_id]
     }
 
     actions = [