Update docker-compose.yml

[antwanchild]

remove reference of "plex-meta-manager" from docker compose

Checklist

• [ ] Is versioning adapted in script?
• [ ] Is versioning adapted in Release.txt?
• [x] I didn't upload any images to the repository.
• [x] I have tested the changed code on:
  • [x] Docker
  • [ ] Windows
  • [ ] Linux
  • [ ] macOS
  • [ ] Unraid