馃崚 wallpapers/image: save the last position for slideshow on exit
The connection to aboutToQuit has to been in QML because on application quit QQuickItem doesn't go through its dtor.
BUG: 482543 FIXED-IN: 6.0.2
(cherry picked from commit e770ec48)
a5383221 wallpapers/image: save the last position for slideshow on exit