search.journal_client: Fix key error

Prior to this commit the key used was origin_url. After running the following through docker, the actual key used is id.

As demonstrated by the stacktrace [1] and the extracted sample [2] (no origin_url but the id).

Also, as plainly defined in the swh.indexer.storage.model module [3]

Related to T2817

• [1] swh/meta$896
• [2] swh/meta$895
• [3] https://forge.softwareheritage.org/source/swh-indexer/browse/master/swh/indexer/storage/model.py$135

Test Plan

tox

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Migrated from D4710 (view on Phabricator)