Remove white background added by Copilot obsessively.

It is not in the original!

Author: HinTak

SkiaGTK4_AdvancedGL_Version2.py

@@ -83,7 +83,6 @@ def create_offscreen_star(self):
         info = skia.ImageInfo.Make(self.star_width, self.star_height, skia.ColorType.kRGBA_8888_ColorType, skia.AlphaType.kPremul_AlphaType)
         star_surface = skia.Surface.MakeRaster(info)
         canvas = star_surface.getCanvas()
-        canvas.clear(skia.ColorWHITE)
         paint = skia.Paint()
         canvas.save()
         canvas.translate(self.star_width/2, self.star_height/2)