tests/test_replay: Fix error after changes in swh-journal API

See https://jenkins.softwareheritage.org/job/DOBJSRPL/job/tests/218/console

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Migrated from D4455 (view on Phabricator)

Build is green

Patch application report for D4455 (id=15773)

Rebasing onto ca21ed29...

Current branch diff-target is up to date.

Changes applied before test

commit 662797a5cb189e9586e17cfd72f38285be812350
Author: Antoine Lambert <antoine.lambert@inria.fr>
Date:   Tue Nov 10 11:49:31 2020 +0100

    tests/test_replay: Fix error after changes in swh-journal API

See https://jenkins.softwareheritage.org/job/DOBJSRPL/job/tests-on-diff/10/ for more details.

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