fix: Remove unused class

Author: twpol

Source/Menu/Notifications/Notifications.cs

@@ -1,4 +1,4 @@
-// COPYRIGHT 2009 - 2024 by the Open Rails project.
+// COPYRIGHT 2009 - 2024 by the Open Rails project.
 // 
 // This file is part of Open Rails.
 // 
@@ -26,12 +26,6 @@ public class Notifications
         public List<Check> CheckList = new List<Check>();
     }
 
-    class JsonInput
-    {
-        public List<Notification> NotificationList { get; set; }
-        public List<Check> CheckList { get; set; }
-    }
-
     public class Notification
     {
         public string Date { get; set; }