Fix when `--verbse` is passed

At the moment `youtube-dl` fails when `--verbose` is passed as one of the args. This fixes the issue.
I realize that `opt[1].indexOf('--verbose')` will never be 0 because `file` will always be the first arg, but don't you agree that it's clearer to to read if this had the usual `.indexOf()` comparison check?

something like `opt[1].indexOf('--verbose') > -1`