#3 -config flag does not exist

[Jaap-Willem Dooge]

When starting netmonitor for the first time (or there is a problem with your logfile), it tells you:
Please run with -config flag

This should be --config.

I've uploaded a diff file here:
https://sourceforge.net/tracker/?func=detail&aid=3376873&group_id=147714&atid=769232