systemdialogs example: ensure that all QML files work with qmlscene

Sync up relative paths in the qrc and the actual directories so that
you can run qmlscene with any of the QML files in this directory
and it will still find the shared resources.

Change-Id: I0f216df6b370c19948312fa00a33ce77ccabcd78
Reviewed-by: Liang Qi <liang.qi@digia.com>