course_navigation typo in stylesheet
course_navigation typo in stylesheet

fixes #6936

test plan:
- add a tool with course navigation from the external tools tab
  (like http://lti-examples.heroku.com/config/course_navigation.xml)
- make sure the tool says "Course navigation configured"
  in the external tools tab

Change-Id: I745d64d6557be4b90851c3301409ffb459a32fe2
Reviewed-on: https://gerrit.instructure.com/8137
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>

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