remove duplicate key

thanks ruby 2.2!

Change-Id: I2f6071a355443b9f0c7b733b20498df9a4e428a2
Reviewed-on: https://gerrit.instructure.com/46324
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>