fix Issue #254 by removing ShortCut from MenuItem

Terminal.Gui/Views/Menu.cs

@@ -86,11 +86,6 @@ namespace Terminal.Gui {
 		/// </summary>
 		public Rune HotKey;
 
-		/// <summary>
-		/// This is the global setting that can be used as a global shortcut to invoke the action on the menu.
-		/// </summary>
-		public Key ShortCut;
-
 		/// <summary>
 		/// Gets or sets the title. 
 		/// </summary>