add cleaner for APT package lists cache in /var/lib/apt/lists

fixes https://github.com/az0/cleanerml/issues/24

I did not want to add a new cleaner for APT in https://github.com/az0/cleanerml, as the cleaner `<id>` must be unique, so it ended up with 2 `APT` entries in bleachbit's interface. I just updated the existing apt.xml file.