Apply upgrading.txt "Improve query editing" upgrade 1.5.1 to 1.6.0.

Allows user to continue edit search query if there is an error in
query. Otherwise search is lost if it is invalid (e.g. duplicate
search name).

Author: rouilj

website/issues/html/issue.search.html

@@ -279,6 +279,7 @@
  <td tal:define="value request/form/@queryname/value | nothing">
   <input name="@queryname" tal:attributes="value value"/>
   <input type="hidden" name="@old-queryname" tal:attributes="value value"/>
+  <input type="hidden" name="@template" value="index|search"/>
  </td>
 </tr>