Don't try to use YUI when AJAX is not enabled

mod/wiki/view.php

@@ -454,6 +454,7 @@
 ";
             }
         } else {
+            if (ajaxenabled()) {
                 // OK, the page is now locked to us. Put in the AJAX for keeping the lock
                 $strlockcancelled=get_string('lockcancelled','wiki');
                 $strnojslockwarning=get_string('nojslockwarning','wiki');
@@ -481,6 +482,7 @@ intervalID=setInterval(function() {
 $strnojslockwarning
 </p></noscript>
 ";
+            }
             // Print editor etc
             print $content;
         }