Fix broken state / my.cnf file

This output/call at the end of the templated my.cnf file causes the ``mysql.server`` state to fail, erroring that:

```
Unable to manage file: Jinja variable 'dict' object has no attribute 'append'
```

``datamap.config`` appears to be a dict object, so outputting it here with the double braces seems illogical, perhaps this was inadvertently added in the recent code updates?  Removing the line generates a valid my.cnf.