added another place to look for logo to make it more consistent (FS#2656)

lib/tpl/dokuwiki/tpl_header.php

@@ -20,7 +20,7 @@ if (!defined('DOKU_INC')) die();
         <h1><?php
             // get logo either out of the template images folder or data/media folder
             $logoSize = array();
-            $logo = tpl_getMediaFile(array(':wiki:logo.png', 'images/logo.png'), false, $logoSize);
+            $logo = tpl_getMediaFile(array(':wiki:logo.png', ':logo.png', 'images/logo.png'), false, $logoSize);
 
             // display logo and wiki title in a link to the home page
             tpl_link(