Critial Bug fix to JsonSerilizer

Fixed bug in SmartHealthCardJwks where duplicate Key objects were output and invalid JSON as there was no comma between the objects. The issue was deep in the JsonSerilizer therefore this bug would have affected many other JSON outputs.
Removed the Minified property from the call to SmartHealthCardJwks.GetJsonWebKeySet() as you can not minify the returned object model, it was only required on the SmartHealthCardJwks.Get() method that returns JSON.