fix(Notification::Win11): Fix double notification

Fixes #893

Author: Belphemur

SoundSwitch/Framework/NotificationManager/MMNotificationClient.cs

@@ -20,7 +20,7 @@ namespace SoundSwitch.Framework.NotificationManager
 {
     public class MMNotificationClient : IMMNotificationClient, IDisposable
     {
-        private record DeviceRole(DataFlow flow, Role role);
+        private record DeviceRole(DataFlow Flow, Role Role);
 
         public static MMNotificationClient Instance { get; } = new();
         private MMDeviceEnumerator _enumerator;
@@ -169,4 +169,4 @@ public void Dispose()
             _enumerator?.Dispose();
         }
     }
-}
+}