fix Kafka test

[filimonov]

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Fix tiny mistake, responsible for some of kafka test flaps. Example report

Introduced c0eea71 cc. @antaljanosbenjamin

There is also another issue with Kafka tests - It can be caused by some resource limits (OOM?) or smth similar #68360 example report,

[gw0] [ 98%] ERROR test_storage_kafka/test.py::test_system_kafka_consumers 
test_storage_kafka/test.py::test_system_kafka_consumers_rebalance Killed

[antaljanosbenjamin]

Wow, rookie mistake from me. Thanks for fixing it!

[robot-ch-test-poll1]

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[antaljanosbenjamin]

test_ldap_external_user_directory/test.py::test_authentication_pass is flaky