test: use shorthand properties

PR-URL: https://github.com/nodejs/node/pull/18105
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-https-truncate.js

@@ -38,7 +38,7 @@ const data = Buffer.alloc(1024 * 32 + 1);
 httpsTest();
 
 function httpsTest() {
-  const sopt = { key: key, cert: cert };
+  const sopt = { key, cert };
 
   const server = https.createServer(sopt, function(req, res) {
     res.setHeader('content-length', data.length);