in HTML tag names are c14nized to upper case.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@5565 71c3de6d-444a-0410-be80-ed276b4c234a

war/resources/scripts/hudson-behavior.js

@@ -972,7 +972,7 @@ function buildFormTree(form) {
                 jsonElement = e;
                 continue;
             }
-            if(e.tagName=="fieldset")
+            if(e.tagName=="FIELDSET")
                 continue;
             var p;
             var type = e.getAttribute("type");