login_class: Fix kqueues, pipebuf resource types

• kqueues is a count but is listed as a size

• pipebuf is a size but is listed as a count

PR: 295623
MFC after: 1 week
Fixes: a4c04958f526 ("libutil: support RLIMIT_PIPEBUF")
Fixes: 85a0ddfd0b26 ("Add a resource limit for the total...")
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D57333

(cherry picked from commit b5dce0ae4f78251f56ffcb6c6a58b9e6c20380e0)