Fix bell behaviour

Author: cesarBLG

Source/RunActivity/Viewer3D/RollingStock/MSTSLocomotiveViewer.cs

@@ -176,7 +176,7 @@ public override void InitializeUserInputCommands()
             UserInputCommands.Add(UserCommand.ControlWiper, new Action[] { Noop, () => new WipersCommand(Viewer.Log, !Locomotive.Wiper) });
             UserInputCommands.Add(UserCommand.ControlHorn, new Action[] { () => new HornCommand(Viewer.Log, false), () => new HornCommand(Viewer.Log, true) });
             UserInputCommands.Add(UserCommand.ControlBell, new Action[] { () => new BellCommand(Viewer.Log, false), () => new BellCommand(Viewer.Log, true) });
-            UserInputCommands.Add(UserCommand.ControlBellToggle, new Action[] { Noop, () => new BellCommand(Viewer.Log, !Locomotive.Bell) });
+            UserInputCommands.Add(UserCommand.ControlBellToggle, new Action[] { Noop, () => new BellCommand(Viewer.Log, !Locomotive.ManualBell) });
             UserInputCommands.Add(UserCommand.ControlAlerter, new Action[] { () => new AlerterCommand(Viewer.Log, false), () => new AlerterCommand(Viewer.Log, true) });
             UserInputCommands.Add(UserCommand.ControlHeadlightIncrease, new Action[] { Noop, () => new HeadlightCommand(Viewer.Log, true) });
             UserInputCommands.Add(UserCommand.ControlHeadlightDecrease, new Action[] { Noop, () => new HeadlightCommand(Viewer.Log, false) });