test: change assert message to default

assert.strictEqual message argument removed to replace
with default assert message to show the expected vs
actual values

PR-URL: nodejs#18259
Refs: nodejs#13296
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/known_issues/test-http-path-contains-unicode.js

@@ -10,11 +10,7 @@ const http = require('http');
 
 const expected = '/café🐶';
 
-assert.strictEqual(
-  expected,
-  '/caf\u{e9}\u{1f436}',
-  'Sanity check that string literal produced the expected string'
-);
+assert.strictEqual('/caf\u{e9}\u{1f436}', expected);
 
 const server = http.createServer(common.mustCall(function(req, res) {
   assert.strictEqual(req.url, expected);