don't show lock timer in readonly mode FS#2146

lib/scripts/locktimer.js

@@ -19,6 +19,7 @@ var locktimer = {
         if(!$('dw__editform')) return;
         locktimer.pageid = $('dw__editform').elements.id.value;
         if(!locktimer.pageid) return;
+        if($('wiki__text').readOnly) return;
 
         // init ajax component
         locktimer.sack = new sack(DOKU_BASE + 'lib/exe/ajax.php');