testtop1m.sh: correct counting of background jobs
testtop1m.sh: correct counting of background jobs

`jobs` command returns multiple lines for a jobs with `if` so counting
number of background jobs was off

PeterMosmans/cipherscan,PeterMosmans/cipherscan,jvehent/cipherscan,MikeDawg/cipherscan,MikeDawg/cipherscan,jvehent/cipherscan,jvehent/cipherscan,PeterMosmans/cipherscan,MikeDawg/cipherscan