Fix missing import (found by Ryan Cross)

 - Legacy-Id: 3659

Author: OleLaursen

ietf/meeting/models.py

@@ -3,6 +3,7 @@
 import pytz, datetime
 
 from django.db import models
+from django.conf import settings
 from timedeltafield import TimedeltaField
 
 from redesign.group.models import Group