[BUGFIX release] Fix Ember.Error inheritance

As pointed out by @schuay #15516 our error constructor essentially calls super twice. The reasons seems to have been an error in ExtendableBuiltin constructor, which did not return its `apply` call. I can’t seem to find the issue ExtendBuiltin is working around. I suspect we can simply remove it

packages/ember-debug/lib/error.js

@@ -1,14 +1,3 @@
-
-function ExtendBuiltin(klass) {
-  function ExtendableBuiltin() {
-    klass.apply(this, arguments);
-  }
-
-  ExtendableBuiltin.prototype = Object.create(klass.prototype);
-  ExtendableBuiltin.prototype.constructor = ExtendableBuiltin;
-  return ExtendableBuiltin;
-}
-
 /**
   A subclass of the JavaScript Error object for use in Ember.
 
@@ -18,15 +7,10 @@ function ExtendBuiltin(klass) {
   @constructor
   @public
 */
-export default class EmberError extends ExtendBuiltin(Error) {
-  constructor(message) {
-    super();
-
-    if (!(this instanceof EmberError)) {
-      return new EmberError(message);
-    }
+export default class EmberError extends Error {
+  constructor(message, code) {
+    let error = super(message, code);
 
-    let error = Error.call(this, message);
     this.stack = error.stack;
     this.description = error.description;
     this.fileName = error.fileName;