fix #110 sortOrder rather than sortorder for the relation list view

allows sort DESC to work by default on related list views (in particular activities should be sorted by start time DESC)

modules/Vtiger/models/RelationListView.php

@@ -217,7 +217,7 @@ class Vtiger_RelationListView_Model extends Vtiger_Base_Model {
if (!$orderBy & PerformancePrefs::getBoolean('LISTVIEW_DEFAULT_SORTING', true)) {
$entityModule=CRMEntity::getInstance($relationModule->name);
$orderBy=$entityModule->default_order_by;
-                        $sortorder=$entityModule->default_sort_order;
+                        $sortOrder=$entityModule->default_sort_order;
}
if($orderBy) {