feat(aria2): mark aria2 seeding as complete (#2223)

Currently if using aria2 to download a torrent file, it does not
consider seeding + active as completed, so the torrent download task
only completes as aria2 stops seeding.

This commit uses seeder property of TaskInfo, and mark tasks with active
status and true seeder as complete.

internal/aria2/monitor.go

@@ -105,7 +105,14 @@ func (m *Monitor) Update() (bool, error) {
 		return true, errors.WithMessage(err, "failed to transfer file")
 	case "error":
 		return true, errors.Errorf("failed to download %s, error: %s", m.tsk.ID, info.ErrorMessage)
-	case "active", "waiting", "paused":
+	case "active":
+		m.tsk.SetStatus("aria2: " + info.Status)
+		if info.Seeder == "true" {
+			err := m.Complete()
+			return true, errors.WithMessage(err, "failed to transfer file")
+		}
+		return false, nil
+	case "waiting", "paused":
 		m.tsk.SetStatus("aria2: " + info.Status)
 		return false, nil
 	case "removed":