Revert ".github/workflows/codeql.yml: add paths"
Revert ".github/workflows/codeql.yml: add paths"

This reverts commit 79eb58e7c12746e882305603c2a01f801ac7f48c.

It doesn't work. CodeQL complains with:

```
Invalid workflow file
The workflow is not valid. .github/workflows/codeql.yml (Line: 12, Col: 1): Unexpected value 'paths'
```

See https://github.com/versatica/mediasoup/actions/runs/3400639647/workflow

versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup,versatica/mediasoup