amd64/conf: Remove a config committed by accident

Approved by: re (cperciva)
Reported by: kib, kp
Fixes: 350ba9672a7f ("unix: Set O_RESOLVE_BENEATH on fds transferred between jails")

(cherry picked from commit 3ef39f58e5d63a78fd1c37e6c62d599bc68d5e1e)
(cherry picked from commit 302120bcb934ea150555362326c812353fb72eaa)