added ID for simplifying testing

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11484 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/hudson/model/AbstractProject/wipeOutWorkspace.jelly

@@ -4,7 +4,7 @@
     <st:include page="sidepanel.jelly" />
     <l:main-panel>
       <h1><img src="${imagesURL}/48x48/folder-delete.gif"/> ${%title}</h1>
-      <form method="post" action="doWipeOutWorkspace">
+      <form id="confirmation" method="post" action="doWipeOutWorkspace">
         <f:submit value="${%Yes}" />
       </form>
     </l:main-panel>