On Android, fullscreen means enabling "immersive mode", which
results in the screen available geometry changing. When restoring
normal mode, oldAvailableGeometry == oldGeometry, which means that
the fullscreen branch would be chosen even though the state is not
fullscreen. By doing the maximized test first, we will default to
non-fullscreen geometry for non-fullscreen windows.

Task-number: QTBUG-39977
Change-Id: Ifc7e8b4de7e96d8c00603ce0cd136b95f58012bb
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>