Add splash abstract route into login test
Add splash abstract route into login test

If using `parent` on a route/state definition but the parent is
not defined, it will silently fail. The login module is used here
but the "splash" route/state is defined in the app module, so we
need to define it here in the test too.

yunity/foodsaving-frontend,yunity/foodsaving-frontend,yunity/karrot-frontend,yunity/foodsaving-frontend,yunity/karrot-frontend,yunity/foodsaving-frontend,yunity/karrot-frontend,yunity/karrot-frontend