Foreman » Installer

Fixes #25304 - Correct handle kafo_modules_dir

In 9929fe2ed9009fdec146a6ee75f2f2d7f084f6f7 the building process was
changed. A regression was introduced that no longer uncommented the
kafo_modules_dir.

Source (config/foreman.yaml):

1. :kafo_modules_dir: /usr/lib/ruby/vendor_ruby/kafo/modules

With the command:

KAFO_MODULES_DIR=/path/to/kafo/modules bundle exec rake

Before the regression it produced:

:kafo_modules_dir: /path/to/kafo/modules

After the regression it didn't uncomment the setting:

1. :kafo_modules_dir: /path/to/kafo/modules

This patch restores the old behavior.