Migrate to EE 9 in Jelly view (#683)

Author: basil

src/main/resources/hudson/tasks/test/TestObject/sidepanel.jelly

@@ -30,7 +30,7 @@ THE SOFTWARE.
   <l:header />
   <l:side-panel>
     <l:tasks>
-      <j:set var="buildUrl" value="${h.decompose(request)}" />
+      <j:set var="buildUrl" value="${h.decompose(request2)}" />
       <j:set var="baseUrl" value="${request2.findAncestor(it).relativePath}"/>
       <st:include it="${it.run}" page="tasks.jelly" optional="true"/>
       <l:task href="${baseUrl}/history" icon="symbol-bar-chart-outline plugin-ionicons-api" title="${%History}"/>