repro-ember-router-service-qp

this app is a partial reproduction of emberjs/ember.js#18683 (but with refreshModel: false)

• run ember s and open the app at http://localhost:4200
• the application controller has a query param foo with default value 'defaultFoo' -- foo never changes value and has refreshModel: false by default
• click the links to transition via link-to -- foo is not serialized to the URL (correctly, imo)
• click the buttons to transition via the router service -- if you changed routes, ?foo=defaultFoo shows up in the URL (incorrectly, imo)