x11/lightdm: Fix autologin
Upstreaam added a pam directive using a pam module not present in FreeBSD:
https://github.com/canonical/lightdm/commit/0c21d986ff3c9ec1568b681c746e30b6fd25d5cb
Fix by updating the patch to remove this addition.
PR: 266899
MFH: 2022Q4
(cherry picked from commit 6cd9fcbb0f03e95189a5eba168af7fcaead34dc1)