configure turns logging off when you say "don't change settings"

**Description**
When you run the configure script with an existing logging configuration, it asks "Do you want to change your logging configuration" with a default of "no". But if you accept the default, it sets the log level to "None".

**Steps to reproduce**
1. Create a configuration with file logging at `trace` level.
2. Rerun the configuration step
3. When it says "do you want to change your logging", say no.

**Actual behavior**
The log level has been set to `none`.

**Expected behavior**
The log level remains at `trace`.

**Environment**
- frl-proxy version: 1.0.1
- OS type and version: both

Start with the configure script's handling of the existing logging configuration and the default "no" response. Reproduce the steps with file logging at trace level, then verify that declining changes leaves the log level at trace rather than setting it to none.

Written by the indexing model from the issue text.