test: see value of "hadError" in tls test

The existing implementation created a state that if the assert failed
we got an error message without the values of hadError.
Removed the default error message and added a comment explaining the
assert.

PR-URL: #22069
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/parallel/test-tls-hello-parser-failure.js

@@ -60,6 +60,7 @@ const server = tls.createServer(options, function(c) {
   }));
 
   client.on('close', common.mustCall(function(hadError) {
-    assert.strictEqual(hadError, true, 'Client never errored');
+    // Confirm that client errored
+    assert.strictEqual(hadError, true);
   }));
 }));