appletwo: fix mono setting being borked on loadstate

BizHawk.Emulation.Cores/Computers/AppleII/AppleII.IStatable.cs

@@ -65,6 +65,8 @@ namespace BizHawk.Emulation.Cores.Computers.AppleII
 			_machine = o.Core;
 			_prevPressed = o.PreviousDiskPressed;
 			_nextPressed = o.NextDiskPressed;
+			// since _machine was replaced, we need to reload settings from frontend
+			PutSettings(_settings);
 		}
 
 		public class OtherData

ExternalCoreProjects/Virtu/Video.cs

@@ -1093,6 +1093,7 @@ namespace Jellyfish.Virtu
         private int _colorYellow;
         private int _colorWhite;
         private int _colorMonochrome;
+		[Newtonsoft.Json.JsonIgnore] // not sync relevant
         private bool _isMonochrome;
         private bool _isTextInversed;
         private ScannerOptions _scannerOptions;