Fix typo in error msg creation
Fix typo in error msg creation

Prevent typo while generating such kind of logs:
"[ERROR] 0 targets did not complete"
"1 of 1 target completed, 0 valid passwords found"
fr34k8/thc-hydra,vanhauser-thc/thc-hydra,vanhauser-thc/thc-hydra,fr34k8/thc-hydra