Remove type annotation

It seems to be broken on some PHP versions:

Argument 1 passed to PMA_Util::configureCurl() must be an instance of
resource, resource given, called in libraries/Config.class.php on line
774 and defined

Seen this on my workstation with PHP 5.6.1 and Google shows some hits of
this as well.

Signed-off-by: Michal Čihař <michal@cihar.com>

libraries/Util.class.php

@@ -4474,7 +4474,7 @@ class PMA_Util
      *
      * @return resource curl_handle with updated options
      */
-    public static function configureCurl(resource $curl_handle)
+    public static function configureCurl($curl_handle)
     {
         if (/*overload*/mb_strlen($GLOBALS['cfg']['ProxyUrl'])) {
             curl_setopt($curl_handle, CURLOPT_PROXY, $GLOBALS['cfg']['ProxyUrl']);