remove screenshot write

lib/web_ui/test/golden_tests/engine/color_filter_golden_test.dart

@@ -72,7 +72,7 @@ void testMain() async {
     html.document.body!.append(builder2.build().webOnlyRootElement!);
 
     await matchGoldenFile('color_filter_blendMode_overlay.png',
-        region: region, write: true);
+        region: region);
   });
 }