test: relax expectations in test-icu-transcode

Chromium's ICU considers "latin1" and "ascii" to mean Windows-1252,
which is consistent with
[WHATWG spec](https://encoding.spec.whatwg.org/#names-and-labels). If
linked against Chromium's ICU, Node.js therefore fails
`test/parallel/test-icu-transcode`.

PR-URL: #25866
Refs: #25851
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>

test/parallel/test-icu-transcode.js

@@ -7,15 +7,15 @@ if (!common.hasIntl)
 
 const buffer = require('buffer');
 const assert = require('assert');
-const orig = Buffer.from('tést €', 'utf8');
+const orig = Buffer.from('těst ☕', 'utf8');
 
 // Test Transcoding
 const tests = {
-  'latin1': [0x74, 0xe9, 0x73, 0x74, 0x20, 0x3f],
+  'latin1': [0x74, 0x3f, 0x73, 0x74, 0x20, 0x3f],
   'ascii': [0x74, 0x3f, 0x73, 0x74, 0x20, 0x3f],
-  'ucs2': [0x74, 0x00, 0xe9, 0x00, 0x73,
+  'ucs2': [0x74, 0x00, 0x1b, 0x01, 0x73,
            0x00, 0x74, 0x00, 0x20, 0x00,
-           0xac, 0x20]
+           0x15, 0x26]
 };
 
 for (const test in tests) {