Test failures on Jenkins due to lack of disk space

Originally created by @intrigeri on #12565 (Redmine)

The branches based on the reproducible builds one fail some tests: https://jenkins.tails.boum.org/job/test_Tails_ISO_bugfix-11971-fontconfig-cache-in-iso/3/cucumberTestReport/. I think I got the snapshots (re-)ordering wrong when working on tails/tails#12354. anonym, could you please take a look and fix it? The same tests pass on feature/stretch.

Feature Branch: bugfix/12565-reorder-features

Parent Task: tails/tails#5630

Edited May 15, 2020 by intrigeri