[test][wildcard-variables] Fix typedef record type.

This switch would've failed regardless. This CL switches the types of the typedef R so that this test would pass.

Bug: #55652
Change-Id: Ic36863a38e3197bd9012907caa9f445faf4945b3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/371021
Commit-Queue: Kallen Tu <kallentu@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>

tests/language/wildcard_variables/declarations/record_type_test.dart

@@ -10,17 +10,17 @@ import 'dart:async';
 
 import 'package:expect/expect.dart';
 
-typedef R = (String _, String _);
+typedef R = (int _, int _);
 
 void main() {
   (int _, int _) record;
   record = (1, 2);
   Expect.equals(1, record.$1);
   Expect.equals(2, record.$2);
 
-  R rType = ('1', '2');
-  Expect.equals('1', rType.$1);
-  Expect.equals('2', rType.$2);
+  R rType = (1, 2);
+  Expect.equals(1, rType.$1);
+  Expect.equals(2, rType.$2);
 
   // Has a named field (which cannot be `_`).
   (int _, int _, {int x}) recordX;