Fix cleaning reminders after subscription purge

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

apps/dav/lib/AppInfo/Application.php

@@ -305,11 +305,11 @@ class Application extends App implements IBootstrap {
 				]);
 
 				/** @var CalDavBackend $calDavBackend */
-				$calDavBackend = $container->query(CalDavBackend::class);
+				$calDavBackend = $container->get(CalDavBackend::class);
 				$calDavBackend->purgeAllCachedEventsForSubscription($subscriptionData['id']);
 				/** @var ReminderBackend $calDavBackend */
-				$reminderBackend = $container->query(ReminderBackend::class);
-				$reminderBackend->cleanRemindersForCalendar($subscriptionData['id']);
+				$reminderBackend = $container->get(ReminderBackend::class);
+				$reminderBackend->cleanRemindersForCalendar((int) $subscriptionData['id']);
 			}
 		);