Running installer script to add crowdsec adds httpChallenge back to config

### Describe the Bug

Installed fresh instance using the installer script. Changed from httpChallenge to dnsChallenge. Ran installer script again to add Crowdsec. traefik_config.yaml was updated to have both the dnsChallenge and httpChallenge sections.

### Environment

- OS Type & Version: Ubuntu 24.04.03 LTS
- Pangolin Version: 1.14.1
- Gerbil Version: 1.3.0
- Traefik Version: 3.6

### To Reproduce

1. Install Pangolin using install script. Say 'no' to Crowdsec.
2. Remove httpChallenge and add dnsChallenge to traefik_config.yaml.
3. Run installer script again and say 'yes' to Crowdsec.
4. traefik_config.yaml should now have both dnsChallenge and httpChallenge sections.

### Expected Behavior

Not adding httpChallenge if dnsChallenge is present.