test: remove messages in assert.strictEqual

PR-URL: nodejs/node#16014
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-tls-pfx-gh-5100-regr.js

@@ -17,11 +17,7 @@ const server = tls.createServer({
   requestCert: true,
   rejectUnauthorized: false
 }, common.mustCall(function(c) {
-  assert.strictEqual(
-    c.authorizationError,
-    null,
-    'authorizationError must be null'
-  );
+  assert.strictEqual(c.authorizationError, null);
   c.end();
 })).listen(0, function() {
   const client = tls.connect({