test: remove string literal from assertion

Remove string literal as assertion message in call to
assert.strictEqual() in test-dns-resolveany-bad-ancount.

Backport-PR-URL: #22888
PR-URL: #22849
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-dns-resolveany-bad-ancount.js

@@ -31,8 +31,8 @@ server.bind(0, common.mustCall(() => {
     assert.strictEqual(err.syscall, 'queryAny');
     assert.strictEqual(err.hostname, 'example.org');
     const descriptor = Object.getOwnPropertyDescriptor(err, 'message');
-    assert.strictEqual(descriptor.enumerable,
-                       false, 'The error message should be non-enumerable');
+    // The error message should be non-enumerable.
+    assert.strictEqual(descriptor.enumerable, false);
     server.close();
   }));
 }));