Add sandlayth to nasqueron-irc group

Summary:
@Sandlayth is helping for Odderon (see D864).

Ref T1129.

Test Plan: id -Gn

Reviewers: dereckson

Reviewed By: dereckson

Subscribers: Sandlayth

Maniphest Tasks: T1129

Differential Revision: https://devcentral.nasqueron.org/D865