textproc/gspell: Fix portscout configuration

It is the 2-nd (minor), not the 1-st (major) part of version number,
that should be even. And limitw: key is 1-based, rather than 0-based,
so it's the (number+1)th version component that will be limited by it.

https://portscout.freebsd.org/info/portscout-portconfig.txt

PR:		258533
Reported by:	zi
Approved by:	gnome (maintainer-timeout)