fix(Tinebase/FileSystem): make upload/save files work for windows ser…

…vers #7141

fixes #7141

fix suggested by https://github.com/AndiFo - thanks for that!

Change-Id: I562b7502593b5f131ef736d88cb4853788197c20
Reviewed-on: http://gerrit.tine20.com/customers/16003
Reviewed-by: Philipp Schüle <p.schuele@metaways.de>
Tested-by: Jenkins CI (http://ci.tine20.com/) <tine20-jenkins@metaways.de>

tine20/Tinebase/FileSystem.php

@@ -1099,7 +1099,7 @@ protected function _checkQuotaAndRegisterRefLog(Tinebase_Model_Tree_Node $_node,
             }
         }
 
-        while (($path = dirname($path)) !== '/') {
+        while (($path = dirname($path)) !== DIRECTORY_SEPARATOR) {
             $parentNode = $this->stat($path);
             $parentNode->size += $_sizeDiff;
             $parentNode->revision_size += $_revisionSizeDiff;