fix printing of error in db:initial_setup

Change-Id: Ib3353b211990eddf242e213ca322179e3005f1a5
Reviewed-on: https://gerrit.instructure.com/29074
Reviewed-by: Rob Orton <rob@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>