[FIX] board: keep group by in context when adding to dashboard

lp bug: https://launchpad.net/bugs/1187512 fixed

bzr revid: mat@openerp.com-20130808150040-ki91kbfie9ink8u0

addons/board/static/src/js/dashboard.js

@@ -381,6 +381,10 @@ instance.board.AddToDashboard = instance.web.search.Input.extend({
         _.each(data.contexts, context.add, context);
         _.each(data.domains, domain.add, domain);
 
+        context.add({
+            group_by: instance.web.pyeval.eval('groupbys', data.groupbys || [])
+        });
+
         var c = instance.web.pyeval.eval('context', context);
         for(var k in c) {
             if (c.hasOwnProperty(k) && /^search_default_/.test(k)) {