Fix some specific zip extraction case on Windows Server.

Author: cdujeu

core/src/plugins/access.fs/class.fsAccessDriver.php

@@ -1598,6 +1598,7 @@ public function extractArchiveItemPreCallback($status, $data){
         $fullname = $data['filename'];
         $size = $data['size'];
         $realBase = AJXP_MetaStreamWrapper::getRealFSReference($this->urlBase);
+        $realBase = str_replace("\\", "/", $realBase);
         $repoName = $this->urlBase.str_replace($realBase, "", $fullname);
 
         $toNode = new AJXP_Node($repoName);