Make Location's toString() actually work

I mistakenly copied all boilerplate from IDL’s unforgeable interfaces concept (which was only ever used for Location) and thereby turned the fallback behavior into the actual behavior (or an exception arguably, as [[Configurable]] is false).

Fixes #2284.

source

@@ -2864,8 +2864,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
          <dfn>@@toStringTag</dfn></li>
      <li><dfn data-x-href="https://tc39.github.io/ecma262/#sec-well-known-intrinsic-objects">Well-Known Intrinsic Objects</dfn>, including
          <dfn data-x-href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor">%ArrayBuffer%</dfn>,
-         <dfn data-x-href="https://tc39.github.io/ecma262/#sec-properties-of-the-array-prototype-object">%ArrayPrototype%</dfn>,
-         <dfn data-x-href="https://tc39.github.io/ecma262/#sec-object.prototype.tostring">%ObjProto_toString%</dfn>, and
+         <dfn data-x-href="https://tc39.github.io/ecma262/#sec-properties-of-the-array-prototype-object">%ArrayPrototype%</dfn>, and
          <dfn data-x-href="https://tc39.github.io/ecma262/#sec-object.prototype.valueof">%ObjProto_valueOf%</dfn></li>
 
      <li>The <dfn data-x="js-prod-FunctionBody" data-x-href="https://tc39.github.io/ecma262/#prod-FunctionBody"><i>FunctionBody</i></dfn> production</li>
@@ -80462,12 +80461,6 @@ State: &lt;OUTPUT NAME=I>1&lt;/OUTPUT> &lt;INPUT VALUE="Increment" TYPE=BUTTON O
    <li><p>Let <var>location</var> be a new <code>Location</code> <span>platform
    object</span>.</p></li>
 
-   <li><p>Perform ! <var>location</var>.[[DefineOwnProperty]]("<code data-x="">toString</code>", {
-   [[Value]]: <span>%ObjProto_toString%</span>,
-   [[Writable]]: false,
-   [[Enumerable]]: false,
-   [[Configurable]]: false }).</p></li>
-
    <li><p>Perform ! <var>location</var>.[[DefineOwnProperty]]("<code data-x="">toJSON</code>", {
    [[Value]]: undefined,
    [[Writable]]: false,
@@ -119188,6 +119181,7 @@ INSERT INTERFACES HERE
   Ami Fischman,
   Amos Jeffries,
   Anders Carlsson,
+  André Bargull,
   Andr&eacute; E. Veltstra,
   Andrea Rendine,
   Andreas<!-- mqmq87 -->,