remove dependentsy of "generate-config-local"

depends on https://github.com/cargomedia/CM/pull/1058
we removed the mapping logic and now we need the local.php file to be copied during the travis-job.

should be mostly the same like this.
https://github.com/mariansollmann/CM/commit/7fcaed3f0ec48365cdf14c34719d26498daf2d87