Don't return DEFAULT_DEVICE_ID in get_sub_device_sessions
Reverts 646b9ca7
Depends on https://github.com/whisperfish/libsignal-service-rs/pull/156 , for secondary device sending to keep working.
Reverts 646b9ca7
Depends on https://github.com/whisperfish/libsignal-service-rs/pull/156 , for secondary device sending to keep working.