Bug fix for https://bugs.launchpad.net/or/+bug/1943837 3D cabs: digitals aren't clamped against Max and MinValue

Author: Csantucci

Source/RunActivity/Viewer3D/RollingStock/MSTSLocomotiveViewer.cs

@@ -2618,6 +2618,7 @@ public string GetDigits(out Color DrawColor)
                 var digital = Control as CVCDigital;
                 string displayedText = "";
                 Num = Locomotive.GetDataOf(Control);
+                if (digital.MinValue < digital.MaxValue) Num = MathHelper.Clamp(Num, (float)digital.MinValue, (float)digital.MaxValue);
                 if (Math.Abs(Num) < digital.AccuracySwitch)
                     Format = Format2;
                 else