Fix icon cache update
Fix icon cache update

broken in 2f2e67b88935259b6e1c214a2c70b4c964f59028

fixes #24

monsta/libmateweather,monsta/libmateweather,monsta/libmateweather,mate-desktop/libmateweather,mate-desktop/libmateweather,mate-desktop/libmateweather,monsta/libmateweather