Decide what to do wrt. Traverso in Tails 4.0
I've removed it in 3a95d599f6c66e86907a2933cd709d104957c6c6 to keep feature/buster building. I've exactly zero indication that anyone uses it in Tails, quite the opposite: I've been told by users they use other software for these needs. Should we bother spending time on making sure this package is in Buster or can we let it go? I propose the latter.