Konrad Kreitmair

[fix] Config editor issues

1

## Checklist - [X] I have read the [OpenWISP Contributing Guidelines](http://openwisp.io/docs/developer/contributing.html). - [X] I have manually tested the changes proposed in this pull request. - [ ] I have written...

[bug] Multiple UI issues in configuration editor for Device

2

**Describe the bug** There are two bugs in the configuration default editor for a Device in the admin. 1. For select fields, with predefined values in the corresponding JSON schema,...