test: use arrow function instead of bind

Using an arrow function here eliminates the need to call `bind()`.

PR-URL: #17202
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: lance

test/parallel/test-https-truncate.js

@@ -67,6 +67,6 @@ const test = common.mustCall(function(res) {
   res.on('data', function(chunk) {
     bytes += chunk.length;
     this.pause();
-    setTimeout(this.resume.bind(this), 1);
+    setTimeout(() => { this.resume() }, 1);
   });
 });