spec: byebug columize gem depedency test

Change-Id: I0c1b025e5a56041accdbdbdb7e3f0240f7977f0d
Reviewed-on: https://gerrit.instructure.com/36796
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
Tested-by: Shawn Meredith <shawn@instructure.com>