KeePassX uses qwerty instead of configured layout

Originally created by @alant on #10961 (Redmine)

To reproduce the issue:

- launch Tails 2.0rc1 on e media containing a persistence with KeePassX configured

- select e.g. french layout

- open KeePassX

- type “a” and click the eye to see what’s written
- you’ll see “q”

This bug prevents to use KeePassX (at least without changing password) if it contains non-qwerty characters.

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