journal: Drop datetime conversion indirection
When nullifying [1] the origin-visit fields, i came across that code which is no longer necessary.
That is even the source of trouble in diffs and master. [3] It's most possibly introduced by [2]
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[1] Depends on D3344
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[3] https://jenkins.softwareheritage.org/job/DSTO/job/tests/1298/console https://jenkins.softwareheritage.org/job/DSTO/job/tests-on-diff/347/testReport/junit/.tox.py3.lib.python3.7.site-packages.swh.storage.tests/test_backfill/test_backfiller/
Test Plan
tox
Migrated from D3345 (view on Phabricator)