Fix test_widgets-windows not running tests (#36468)


diff --git a/dev/bots/test.dart b/dev/bots/test.dart
index 27d4a2f..f103674 100644
--- a/dev/bots/test.dart
+++ b/dev/bots/test.dart
@@ -370,7 +370,7 @@
       path.join(flutterRoot, 'packages', 'flutter'),
       tableData: bigqueryApi?.tabledata,
       tests: <String>[
-        'test/widgets/',
+        path.join('test', 'widgets') + path.separator,
       ],
     );
     // Only packages/flutter/test/widgets/widget_inspector_test.dart really
@@ -382,7 +382,7 @@
       options: <String>['--track-widget-creation'],
       tableData: bigqueryApi?.tabledata,
       tests: <String>[
-        'test/widgets/',
+        path.join('test', 'widgets') + path.separator,
       ],
     );
   }