fix update.php

sanity_check must be included after config or it will always fail to find nonstandard folders

update.php

@@ -9,8 +9,8 @@
 
 	require_once "functions.php";
 	require_once "rssfuncs.php";
-	require_once "sanity_check.php";
 	require_once "config.php";
+	require_once "sanity_check.php";
 	require_once "db.php";
 	require_once "db-prefs.php";