Fix typo in docker-compose.yaml for Knowage-Server-Docker

[carmisergio]

Changed port mapping of knowage service from "18080:8080" to "8080:8080" I assume this was a typo, because it's impossible to access the knowage web interface with the setting as it is, but after changing it as described above, the interface works as intended.

[github-actions[bot]]

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[carmisergio]

I have read the CLA Document and I hereby sign the CLA

[kerny3d]

Just a note about that: we chose to set the port to 18080 because during our developments we use to have two instances of KNOWAGE running on the same machine, one on the 8080 and one on the 18080. We consider the docker-compose.yaml as a template file someone copies outside the repo and edits with his own customization. But we are widely open to suggestions.