Fix: Focus automatically on help pop dialog when help button is clicked
Fix: Focus automatically on help pop dialog when help button is clicked

This fix here attempts to make the focus logical, it binds a handler
to the ready and close event placing focus on the popup element
and place focus back on the button when the popup closes.

Bug: T257167
Change-Id: I3338bb27a6f7516b9b5d1fe17cfac2b8ad49be42

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui