fix - Fixed notification manager causing hang

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We've fixed the notification manager causing hang in the kernel when
trying to shut it down and it fails.

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Type: fix
Breaking: False
Doc Required: False
Backport Required: False
Part: 1/1

public/Nitrocid/Misc/Notifications/NotificationManager.cs

@@ -83,7 +83,9 @@ private static void NotifListen()
                 List<Notification> NewNotificationsList;
                 while (!PowerManager.KernelShutdown)
                 {
-                    SpinWait.SpinUntil(() => sent || dismissing);
+                    SpinWait.SpinUntil(() => sent || dismissing || PowerManager.KernelShutdown);
+                    if (PowerManager.KernelShutdown)
+                        continue;
                     if (dismissing)
                     {
                         dismissing = false;