test: add skipIfInspectorDisabled to debugger-pid

Currently this test will fail if node was configured --without-ssl.

PR-URL: #12882
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

Author: danbev

test/parallel/test-debugger-pid.js

@@ -1,5 +1,6 @@
 'use strict';
 const common = require('../common');
+common.skipIfInspectorDisabled();
 const assert = require('assert');
 const spawn = require('child_process').spawn;