Update dtthemedgauge.pas Bad Line draw parameter in DrawPointer

When testing out the Themed gauge it would work fine IF you didn't change the default size. If you did the Pointer would be all over the place.

Found a flip parameter in the DrawPointer method that had both points sent to some y values. 

Minor change.

dtthemedgauge.pas

@@ -246,7 +246,7 @@ begin
   X := origin.CenterPoint.x - Round(PointerSettings.Length * cos((j + Position * 270 / ScaleSettings.Maximum) * Pi / 180));
   Y := origin.CenterPoint.y - Round(PointerSettings.Length * sin((j + Position * 270 / ScaleSettings.Maximum) * Pi / 180));
 
-  FPointerBitmap.DrawLineAntialias(origin.CenterPoint.y, origin.CenterPoint.y, x, y, PointerSettings.Color, PointerSettings.Thickness);
+  FPointerBitmap.DrawLineAntialias(origin.CenterPoint.x, origin.CenterPoint.y, x, y, PointerSettings.Color, PointerSettings.Thickness);
 
   // Draw cap over needle
   FPointerBitmap.EllipseAntialias(origin.CenterPoint.x, origin.CenterPoint.y, PointerCapSettings.Radius, PointerCapSettings.Radius, PointerCapSettings.EdgeColor, 2, ColorToBGRA(PointerCapSettings.FillColor));