QIconLoader: Change the order fallback icon lookup order
QIconLoader: Change the order fallback icon lookup order

From the standard: "Icons and themes are looked for in a set of
directories. By default, apps should look in $HOME/.icons
(for backwards compatibility), in $XDG_DATA_DIRS/icons and in
/usr/share/pixmaps (in that order)."

DrTobe/libqtxdg,DrTobe/libqtxdg,luis-pereira/libqtxdg,luis-pereira/libqtxdg,libqtxdg/libqtxdg,DrTobe/libqtxdg,libqtxdg/libqtxdg,lxde/libqtxdg,lxde/libqtxdg