net/samba419: Fix procfd search patterns for FreeBSD

PR: 277878
Approved by: jrm (mentor)
Tested by: michaelo, Antti Rasinen
MFH: 2025Q1
Differential Revision: https://reviews.freebsd.org/D48313

(cherry picked from commit 39b0576274424e915fc1208c5cb50ca7880964dc)