LibWeb: Fix CSS clip-path ignoring scroll position

Author: https://github.com/Psychpsyo
Commit: 8cd2fe3d08
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3247
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/Gingeh ✅

Libraries/LibWeb/Painting/Command.h

@@ -128,6 +128,9 @@ struct PushStackingContext {
     {
         source_paintable_rect.translate_by(offset);
         transform.origin.translate_by(offset.to_type<float>());
+        if (clip_path.has_value()) {
+            clip_path.value().transform(Gfx::AffineTransform().translate(offset.to_type<float>()));
+        }
     }
 };