fix an analysis ignore for the missing_required_param hint (#47956)

packages/flutter/test/material/popup_menu_test.dart

@@ -791,7 +791,7 @@ void main() {
                   onPressed: () {
                     // Ensure showMenu throws an assertion without a position
                     expect(() {
-                      // ignore: missing_required_param_with_details
+                      // ignore: missing_required_param
                       showMenu<int>(
                         context: context,
                         items: <PopupMenuItem<int>>[