Stop also rotating wagon wheels when brake skid

Author: Csantucci

Source/RunActivity/Viewer3D/RollingStock/MSTSWagonViewer.cs

@@ -738,19 +738,15 @@ private void UpdateAnimation(RenderFrame frame, ElapsedTime elapsedTime)
             if (Car.BrakeSkid) // if car wheels are skidding because of brakes locking wheels up then stop wheels rotating.
             {
                 // Temporary bug fix (CSantucci)
-                if (MSTSWagon is MSTSLocomotive loco)
+                if (MSTSWagon is MSTSLocomotive loco && loco.DriveWheelOnlyBrakes)
                 {
-                    if (loco.DriveWheelOnlyBrakes)
-                    {
-                        distanceTravelledDrivenM = 0.0f;
-                    }
-                    else
-                    {
-                        distanceTravelledM = 0.0f;
-                        distanceTravelledDrivenM = 0.0f;
-                    }
+                    distanceTravelledDrivenM = 0.0f;
+                }
+                else
+                {
+                    distanceTravelledM = 0.0f;
+                    distanceTravelledDrivenM = 0.0f;
                 }
-
             }
 
             // Running gear and drive wheel rotation (animation) in steam locomotives