Fetching OpenPGP keys using Seahorse fails.

Fetching OpenPGP keys via gnupg via commandline works, but fails when using seahorse and OpenPGP Applet (features/torified_gnupg.feature:21, 26):

    When I fetch the "D21739E9" OpenPGP key using Seahorse
    And the Seahorse operation is successful
    Then the "0EE5BE979282D80B9F7540F1CCD2ED94D21739E9" key is in the live user's public keyring

Feature Branch: https://salsa.debian.org/tails-team/tails/merge_requests/2

Parent Task: #16281 (closed)

Original created by @Hefee on 16621 (Redmine)

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