remove `write` parameter from _checkScreenshot (#20340)

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

@@ -23,7 +23,7 @@ void main() async {
   // Commit a recording canvas to a bitmap, and compare with the expected
   Future<void> _checkScreenshot(RecordingCanvas rc, String fileName,
       {Rect region = const Rect.fromLTWH(0, 0, 500, 500),
-        double maxDiffRatePercent = 0.0, bool write = false}) async {
+        double maxDiffRatePercent = 0.0}) async {
     final EngineCanvas engineCanvas = BitmapCanvas(screenRect);
 
     rc.endRecording();
@@ -35,7 +35,7 @@ void main() async {
       sceneElement.append(engineCanvas.rootElement);
       html.document.body.append(sceneElement);
       await matchGoldenFile('$fileName.png',
-          region: region, maxDiffRatePercent: maxDiffRatePercent, write: write);
+          region: region, maxDiffRatePercent: maxDiffRatePercent);
     } finally {
       // The page is reused across tests, so remove the element after taking the
       // Scuba screenshot.