Revert Demo SSB SNS change

Changing the region results in Terraform not wanting to apply the change, so back this out for now while we figure out how to fix this to get the Demo site working again.

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

terraform/demo/main.tf

@@ -71,6 +71,6 @@ module "sns_sms" {
   cf_org_name         = local.cf_org_name
   cf_space_name       = local.cf_space_name
   name                = "${local.app_name}-sns-${local.env}"
-  aws_region          = "us-west-2"
+  aws_region          = "us-east-1"
   monthly_spend_limit = 25
 }