[PHP 8.4] Fix: Curl CURLOPT_BINARYTRANSFER deprecated

The `CURLOPT_BINARYTRANSFER` PHP constant from the Curl extension was no-op since
PHP 5.1, and is deprecated in PHP 8.4. This removes the constant usage to avoid
the deprecation notice in PHP 8.4 and later.

Because this constant was no-op since PHP 5.1 (circa 2005), this change has no
impact.

See:

 - [PHP.Watch - PHP 8.4 - Curl: CURLOPT_BINARYTRANSFER deprecated](https://php.watch/versions/8.4/CURLOPT_BINARYTRANSFER-deprecated)
 - [commit](php/php-src@fc16285)

php/elFinder.class.php

@@ -2706,7 +2706,6 @@ protected function curl_get_contents(&$url, $timeout, $redirect_max, $ua, $outfp
             curl_setopt($ch, CURLOPT_FILE, $outfp);
         } else {
             curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
-            curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
         }
         curl_setopt($ch, CURLOPT_LOW_SPEED_LIMIT, 1);
         curl_setopt($ch, CURLOPT_LOW_SPEED_TIME, $timeout);