Bump QtQuick.Window import version

Use 2.2 to get access to revision 2 signals.

Particularly interesting is sceneGraphError() which allows graceful
handling of OpenGL context creation failures even from QML, inside
the ApplicationWindow items.

Change-Id: Ie2ec98a438a05d35e4c9f9459a6ac49887147149
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>