I did the same process and it did not work..

Delete below from the installed_extensions.php should fix the problem.

1 =>
  array (
    'name' => 'Auth_LDAP',
    'package' => 'auth_ldap',
    'version' => '2.3.5-1',
    'type' => 'extension',
    'active' => false,
    'path' => 'modules/auth_ldap',
  ),