[ticket/13740] Restore original install folder

This reverts commit 934e2821f1cef5e2e21ad6d96f7beb45647ed81c.

PHPBB3-13740

phpBB/install/phpinfo.php

@@ -0,0 +1,14 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+phpinfo();