http: add default argument for Agent.prototype.getName

PR-URL: https://github.com/nodejs/node/pull/41906
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>

lib/https.js

@@ -203,7 +203,7 @@ Agent.prototype.createConnection = createConnection;
  *   }} [options]
  * @returns {string}
  */
-Agent.prototype.getName = function getName(options) {
+Agent.prototype.getName = function getName(options = {}) {
   let name = FunctionPrototypeCall(HttpAgent.prototype.getName, this, options);
 
   name += ':';