Only process push messages for the current logged in user. Do not unregister from push on logout.

src/iOS/AppDelegate.cs

@@ -65,7 +65,6 @@ namespace Bit.iOS
                 Resolver.Resolve<ISyncService>(),
                 Resolver.Resolve<IFingerprint>(),
                 Resolver.Resolve<ISettings>(),
-                Resolver.Resolve<IPushNotification>(),
                 Resolver.Resolve<ILockService>(),
                 Resolver.Resolve<IGoogleAnalyticsService>()));