Importing a configuration fails for distributed configurations using the REST API

The REST API endpoint to import a configuration fails if you want to import a distributed configuration on the Slave side.

Steps to reproduce

1. Export Master + Slave using REST

2. Import Master Config using REST

Expected result

Import is working and user can publish draft on Master side, so that Slave can update it.

Actual result

REST API returns an error as soon as you try to import a configuration.