Modify shift_registration state condition to match actual use

lacagette_addons/lacagette_shifts/models/lacagette_shift_registrations.py

@@ -25,7 +25,7 @@ class ShiftRegistration(models.Model):
         now = datetime.datetime.now()
         yesterday = now - datetime.timedelta(hours=24)
         reg_targets = shift_env.search([
-            ('state', 'in', ['open', 'excused']),
+            ('state', 'in', ['excused']),
             ('date_begin', '>=', yesterday.strftime("%Y-%m-%d %H:%M:%S")),
             ('date_begin', '<', now.strftime("%Y-%m-%d %H:%M:%S"))
         ])