Courses index right sidebar breaking layout

fixes CNVS-15246

There was a random </div> close tag in here that was causing
the right sidebar to be pushed wayyyy right. This fixes it.

Test plan:

- Go to /accounts/
- Choose an account you know has courses
- On that index page the right sidebar should no longer be pushed
all the way to the right

Should look like this now: http://cl.ly/image/1N253D1b2F0u

Change-Id: Ibc813ddbf8051f0514673e3bba9e1da86d285123
Reviewed-on: https://gerrit.instructure.com/41182
Reviewed-by: Chris Hart <chart@instructure.com>
QA-Review: Anna Koalenz <akoalenz@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Colleen Palmer <colleen@instructure.com>