Fix Bug In Settings For Push Notifications

- Fix issue where enabling push notifications from the settings view
  resulted in an error message

Fixes #419

Author: thedillonb

CodeHub.iOS/AppDelegate.cs

@@ -82,6 +82,7 @@ public override bool FinishedLaunching(UIApplication app, NSDictionary options)
             Locator.CurrentMutable.RegisterConstant(Mvx.Resolve<IFeaturesService>());
             Locator.CurrentMutable.RegisterConstant(Mvx.Resolve<ILoginService>());
             Locator.CurrentMutable.RegisterConstant(Mvx.Resolve<IMarkdownService>());
+            Locator.CurrentMutable.RegisterConstant(Mvx.Resolve<IPushNotificationsService>());
 
             Locator.CurrentMutable.RegisterLazySingleton(
                 () => new ImgurService(), typeof(IImgurService));