Bug#1142423: koko crashes when opening images after kf6-kirigami upgrade to 6.26

[Marco Mattiolo]

Additional info:
launching koko with
QT_QUICK_CONTROLS_MOBILE=true koko
makes it crash even on amd64 VM (plasma-desktop, not plasma-mobile).

And vice versa,
QT_QUICK_CONTROLS_MOBILE=false koko
does not crash even in plasma-mobile.

Marco