Set Thunderbird preferences previously set by TorBirdy
TorBirdy sets a lot of Thunderbird preferences, see https://gitweb.torproject.org/torbirdy.git/tree/components/torbirdy.js#n535.
We should go through all of them, check whether they make sense in the context of Tails, and set them in our Thunderbird preferences.
Feature Branch: feature/17219-replace-torbirdy
Parent Task: #17219
Original created by @segfault on 17220 (Redmine)