Configuration variable POLLUX_STATUS_LIST_REGISTRY_PUBLIC_URL should default to REST_SERVICE_URL instead localhost

### Is this a regression?

Yes

### Description

The default configuration in `application.conf` defaults the `POLLUX_STATUS_LIST_REGISTRY_PUBLIC_URL` variable to `localhost`, instead we should default it to `REST_SERVICE_URL` which is the agent itself

### Please provide the exception or error you saw

```Markdown
If the variable is not set the revocation registry url returns `localhost:8085`
```

### Please provide the environment you discovered this bug in

_No response_

### Anything else?

_No response_