DAOS-15835 test: remove invalid argument

[daltonbohning]

The group argument was removed by #14201.

Skip-unit-tests: true
Skip-fault-injection-test: true

Required-githooks: true

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• Two review approvals and any prior change requests have been resolved.
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• Features: (or Test-tag*) commit pragma was used or there is a reason documented that there are no appropriate tags for this PR.
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• Any tests skipped by the ticket being addressed have been run and passed in the PR.

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• Checkpatch issues are resolved. Pay particular attention to ones that will show up on future PRs.
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• Sufficient testing is done. Check feature pragmas and test tags and that tests skipped for the ticket are run and now pass with the changes.
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• Fix the commit message upon landing. Check the standard here. Edit it to create a single commit. If necessary, ask submitter for a new summary.

[github-actions]

Ticket title is '1,2-./erasurecode/restart.py:EcodServerRestart.test_ec_restart_after_agg fails with TypeError.'
Status is 'In Progress'
Labels: 'ci_impact,triaged,weekly_test'
https://daosio.atlassian.net/browse/DAOS-15835

[daltonbohning]

Affected test passed: https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-14362/1/testReport/FTEST_erasurecode/