Restore FLAG_GROUP_SUMMARY when archiving canceled summary

 If the summary was canceled because its child was moved to a bundle, FLAG_GROUP_SUMMARY needs to be restored before the notification is archived.

Flag: android.service.notification.notification_classification

Test: atest NotificationManagerServiceTest

Bug: 416473299
Change-Id: I6181e0c3a062f61481d45bf0ad7e337e0f705ff3