better poll editing - fixes #668

* editing _just the poll_ is now recognised as an actual change to the
  note
* the "poll ended" notification job is now replaced (with potentially
  the new expiry time)

packages/backend/src/core/NoteCreateService.ts

@@ -629,6 +629,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 			this.queueService.endedPollNotificationQueue.add(note.id, {
 				noteId: note.id,
 			}, {
+				jobId: `pollEnd:${note.id}`,
 				delay,
 				removeOnComplete: true,
 			});