additionally to the menu having focus, if a submenu of that menu has
focus, then restore the focus when the whole hierarchy execution ends
return focus to the toplevel menu's saved focus widget

Change-Id: Iefd467fb1ba67ffd0a303505a893d2453e0ffbb3
Reviewed-on: https://gerrit.libreoffice.org/66115
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>