Updating dictionary force_destroy value in fastly_service_vcl remakes the dictionary

When you change the value of force_destroy from false to true in fastly_service_vcl the terraform then deletes and remakes the dictionary instead of updating the current one to have the force_destroy flag.

I think the expected behavior should be to just update the existing one rather than making a new one because this causes issues with losing existing dictionary items due to the update.