Fix bug 4361642 - Action menu unresponsive after orientation change

Through invalidating panel menus and action bar initialization it was
possible for instance state restoration to throw out a new menu
already in use. Invalidate the menu if it already exists instead. The
saved instance state will be applied later if a relevant panel menu is
shown.

Change-Id: I6bad7640ecb8d2f5f8ea658e1c68b07d52d108b9