Always refresh device profile when multi window mode changed

Launcher monitors multi-window mode changed and updates device profile
through configuration chagned callback. It's possible that a new
configuration contains multi-window mode changed but without screen
size size change that across screen layout qualifier. Client apps might
not even receive onConfingurationChagned.

Updates Launcher to monitor multi-window mode changed through
onMultiWindowModeChanged to make sure it always refreshes device profile
that matches with the latest mulati-window mode.

Fix: 197835119
Test: manual check the repo steps.
Change-Id: Ie99045a1fc8493ff37645b95e7ccd9d15478d862