Fix Bug 394946 - Delete key no longer works in articles list after using...

Fix Bug 394946 - Delete key no longer works in articles list after using search - keyboard focus stays in search field

FIXED-IN: 5.11.1
BUG: 394946

Now we can use "ESCAPE" key to force lost focus. When you press on it
it will give the focus to treelist. So you can use keyboard for
navagating in list. (delete item etc.)