remove a troublesome line of code

remove a troublesome line of code

Whenever SYSCF was enabled on Windows, the option
processing would go bonkers with illegal options
at startup. I noticed it months ago, and Derek
had it happen the other evening.

It turns out, the hard-coded 'defaults.nh' setting
was being overwritten with the name sysconf on
the first SET_IN_SYS pass, so all subsequent passes
were re-opening the SYSC_FILE instead of the
user config file.

I opted to take it out as I couldn't ascertain
why it was there in the first place.