properly decode policy id

lib/policy_service/aggregates/policy_id.ex

@@ -43,6 +43,10 @@ defmodule PolicyService.Aggregates.PolicyId do
   end
 
   defimpl Commanded.Serialization.JsonDecoder do
+    def decode(%{org_id: org_id, policy_type: policy_type, application_id: application_id}) do
+      PolicyService.Aggregates.PolicyId.new(org_id, policy_type, application_id)
+    end
+
     def decode(id), do: id
   end
 end