Fix broken timestamp replacement.

templates/2k11/admin/serendipity_editor.js.tpl

@@ -690,7 +690,7 @@ var AccessifyHTML5 = function (defaults, more_fixes) {
     //
     // Make the timestamp readable in browser not supporting datetime-local.
     // Has no effect in those supporting it, as the timestamp is invalid in HTML5
-    if($entryEditor.size() > 0) {
+    if($('body').has('#serendipityEntry').size() > 0) {
         $('#serendipityNewTimestamp').val($('#serendipityNewTimestamp').val().replace("T", " "));
     }