remove barista initializer, we don't use it anymore

a long time ago we stopped using barista to compile
our coffeescript for us but we forgot to delete this
initializer

Change-Id: I920ec88ff9f9021371e22fa5eb3e7f1fff022d63
Reviewed-on: https://gerrit.instructure.com/34568
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: Jeremy Stanley <jeremy@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>
QA-Review: Ryan Shaw <ryan@instructure.com>