sysutils/slurm-wlm: Fixes failure due to lingering /proc assumptions
Add missing PROC2FIX entries to unbreak runtime.
PR: 288880
Differential Revision: https://reviews.freebsd.org/D52144
MFH: 2025Q3
(cherry picked from commit 46d0a8b9a2780ff35810be88bf6c808b8b1145b6)