fix: Fix creating routes for sourced subnets (#51)

Author: acelebanski

modules/subnet_set/outputs.tf

@@ -15,7 +15,7 @@ output "route_tables" {
 }
 
 output "unique_route_table_ids" {
-  value = var.create_shared_route_table ? { "shared" = aws_route_table.shared["shared"].id } : { for k, v in aws_route_table.this : k => v.id }
+  value = var.create_shared_route_table ? { "shared" = aws_route_table.shared["shared"].id } : { for k, v in local.route_tables : k => v.id }
 }
 
 output "availability_zones" {