feat: remove ambiguous log entry

It remvoes this line:

```
2024-06-17T18:52:49.196708Z  INFO torrust_tracker::bootstrap::jobs: TLS not enabled
```

becuase it doesn't specifu which service the TSl is not enabled for.

On the other hand, the output already indicates whether the service is
runnig on HTTP or HTTPs:

```
2024-06-18T07:37:58.595692Z  INFO HTTP TRACKER: Started on: http://0.0.0.0:7070
```

src/bootstrap/jobs/mod.rs

@@ -44,7 +44,6 @@ pub async fn make_rust_tls(opt_tsl_config: &Option<TslConfig>) -> Option<Result<
  )
  }
  None => {
- info!("TLS not enabled");
  None
  }
  }