linux: setgroups(): Fix the group number's upper limit

'ngroups_max' is the maximum number of supplementary groups the system
will accept, and this has not changed.

Fixes: 9da2fe96ff2e ("kern: fix setgroups(2) and getgroups(2) to match other platforms")
MFC after: 5 days
MFC to: stable/15
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D52277