Remove unused Grit configuration settings
This caused confusion with a customer issue in https://gitlab.com/gitlab-org/gitlab-ee/issues/3461 and continues on the work in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7308.
This caused confusion with a customer issue in https://gitlab.com/gitlab-org/gitlab-ee/issues/3461 and continues on the work in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7308.