tweak(CoreData): expand node on click

Change-Id: I8eaee1b53f9d725e18b6840bdf63b6b6404cb529
Reviewed-on: http://gerrit.tine20.com/customers/12041
Tested-by: Jenkins CI (http://ci.tine20.com/) <tine20-jenkins@metaways.de>
Reviewed-by: Philipp Schüle <p.schuele@metaways.de>

tine20/CoreData/js/TreePanel.js

@@ -93,7 +93,8 @@ Ext.extend(Tine.CoreData.TreePanel, Ext.tree.TreePanel, {
                         path: path + '/' + coreData.application_id.id,
                         id: coreData.application_id.id,
                         text: coreDataApp.i18n._(coreData.application_id.name),
-                        attributes: coreData.application_id
+                        attributes: coreData.application_id,
+                        singleClickExpand: true
                     });
                 }