fix icon artifacts still showing in newfiles

fixes: CNVS-16447

for testplan see:
http://screencast.com/t/PjcxZVRJ27oo

Change-Id: I60e737505c0747fd34f47b3ac616be66074f2782
Reviewed-on: https://gerrit.instructure.com/43310
Reviewed-by: Clay Diffrient <cdiffrient@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Jahnavi Yetukuri <jyetukuri@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>