Fix Radial Gauge ScaleTickBrush color assignment

Due to a typo or a merge conflict, the ScaleTickBrush of the RadialGauge control currently gets the color of the ScaleBrush instead of its own.

Author: XamlBrewer

Microsoft.Toolkit.Uwp.UI.Controls.Input/RadialGauge/RadialGauge.cs

@@ -680,7 +680,7 @@ private void OnColorsChanged()
                 ClearBrush(_needleBrush, NeedleBrushProperty);
                 ClearBrush(_trailBrush, TrailBrushProperty);
                 ClearBrush(_scaleBrush, ScaleBrushProperty);
-                ClearBrush(_scaleBrush, ScaleTickBrushProperty);
+                ClearBrush(_scaleTickBrush, ScaleTickBrushProperty);
                 ClearBrush(_tickBrush, TickBrushProperty);
                 ClearBrush(_foreground, ForegroundProperty);
             }
@@ -690,7 +690,7 @@ private void OnColorsChanged()
                 RestoreBrush(_needleBrush, NeedleBrushProperty);
                 RestoreBrush(_trailBrush, TrailBrushProperty);
                 RestoreBrush(_scaleBrush, ScaleBrushProperty);
-                RestoreBrush(_scaleBrush, ScaleTickBrushProperty);
+                RestoreBrush(_scaleTickBrush, ScaleTickBrushProperty);
                 RestoreBrush(_tickBrush, TickBrushProperty);
                 RestoreBrush(_foreground, ForegroundProperty);
             }
@@ -828,4 +828,4 @@ private double RoundToMultiple(double number, double multiple)
             return number + modulo;
         }
     }
-}
+}