fix gear menu placement in new files

fixes: CNVS-15264

test plan:
open new files,
click the gear menu on the file/folder at the bottom
of the list.
it should not appear above the cog like this
http://screencast.com/t/baNGQo4ma5tw

Change-Id: I59d1716994cfd3337ab9554a44513bdd9ac01d98
Reviewed-on: https://gerrit.instructure.com/40793
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Reviewed-by: Sterling Cobb <sterling@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>