appview: init notifier in strings

Signed-off-by: oppiliappan <[e-mail]>

appview/state/router.go

···
 		Enforcer:   s.enforcer,
 		IdResolver: s.idResolver,
 		Knotstream: s.knotstream,
+		Notifier:   s.notifier,
 		Logger:     logger,
 	}