net-mgmt/netdata: Fix ML option

Fix option that accidently broke during rebase

PR: 272279
Reported by: Trond Endrestol <Trond.Endrestol@ximalas.info>
Tested by: Trond Endrestol <Trond.Endrestol@ximalas.info>
Reviewed by: Namkhai B <me@forkbomb9.ch> (private email)