[logs] --filter should accept the one-off router

[btrd]

It's already possible to filter by on a specific one-off instance, for example scalingo logs -F one-off-1 but not on all one-off.

Asked by https://app.intercom.com/a/inbox/w4oogu7s/inbox/shared/all/conversation/12375700095473?view=List

Edit :
The customer would like top be able to retrieve logs from all his one-off by using this command:
scalingo logs -F one-off