notifications: fix at_desk delay

* The delay for at_desk notification is set in minutes in the ui/data
but must be passed in seconds to the dispatcher.
* Closes rero#3467.

Co-Authored-by: Pascal Repond <pascal.repond@rero.ch>

rero_ils/modules/notifications/subclasses/availability.py

@@ -92,10 +92,11 @@ def get_notification_context(cls, notifications=None):
             'delay': 0
         }
         # Availability notification could be sent with a delay. We need to find
-        # this delay into the library notifications settings.
+        # this delay into the library notifications settings and convert it
+        # from minutes to seconds.
         for setting in library.get('notification_settings', []):
             if setting['type'] == NotificationType.AVAILABILITY:
-                context['delay'] = setting.get('delay', 0)
+                context['delay'] = setting.get('delay', 0)*60
         # Add metadata for any ``notification.loan`` of the notifications list
         item_dumper = ItemNotificationDumper()
         for notification in notifications: