This commit removes external deps for horizon. They can safely be removed b/c they are now declared from within the ::horizon class as of https://github.com/puppetlabs/puppetlabs-horizon/pull/55
This commit removes external deps for horizon. They can safely be removed b/c they are now declared from within the ::horizon class as of https://github.com/puppetlabs/puppetlabs-horizon/pull/55