Fix typo in startupWorkerExit
Fix typo in startupWorkerExit

Noticed in https://www.mediawiki.org/w/index.php?title=Topic:U9d7rz6sn1ot6ped&topic_showPostId=u9dakro465hnjewx#flow-post-u9dakro465hnjewx

wikimedia/service-runner,Pchelolo/service-runner,d00rman/service-runner