test: change style in test-cli-bad-options

Replace string concatenation in test/parallel/test-cli-bad-options.js
with template literal. Adjust argument layout for readability.

PR-URL: #14274
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

Author: boydfd

test/parallel/test-cli-bad-options.js

@@ -18,6 +18,8 @@ function requiresArgument(option) {
   assert.strictEqual(r.status, 9);
 
   const msg = r.stderr.split(/\r?\n/)[0];
-  assert.strictEqual(msg, process.execPath + ': ' + option +
-                     ' requires an argument');
+  assert.strictEqual(
+    msg,
+    `${process.execPath}: ${option} requires an argument`
+  );
 }