api.tests.test_async: Simplify fixture setup

No need to repeat the cli instantiation in each asyncio test

Test Plan

tox

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Migrated from D4298 (view on Phabricator)

Build is green

Patch application report for D4298 (id=15186)

Rebasing onto 1657fb82...

Current branch diff-target is up to date.

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commit 7f928a07d91460efbbfbc6c5264a4fdd60e58be2
Author: Antoine R. Dumont (@ardumont) <ardumont@softwareheritage.org>
Date:   Sun Oct 18 10:25:01 2020 +0200

    api.tests.test_async: Simplify fixture setup

See https://jenkins.softwareheritage.org/job/DCORE/job/tests-on-diff/92/ for more details.

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