css: forgot a class on the fixed warning bar
css: forgot a class on the fixed warning bar

while refactoring, a css class got dropped from the fixed warning bar at the
bottom of the page.

test plan:
- this is currently only testable in the cloud beta environment
- make sure the bottom warning bar looks right, with the light red background

Change-Id: Id115c14d458e0f0c2ba737cd380f58f1e6dfc39a
Reviewed-on: https://gerrit.instructure.com/12180
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>

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