Make 'View Feedback' Link show on smaller screens
Make 'View Feedback' Link show on smaller screens

fixes GRADE-346

Test Plan:
  - Go to the submissions details page for an assignment
    that has feedback such as canvadocs annotations
  - View the screen at various sizes
  - You shouldn't need to go full screen on a high res
    display to see the link

Change-Id: Ie80bebef058b465ba440276b618e3bdd02a681de
Reviewed-on: https://gerrit.instructure.com/131580
Reviewed-by: Jeremy Neander <20252aad5efdc666f083d82ab63ed0f9f72a043e@instructure.com>
Reviewed-by: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
Tested-by: Jenkins
QA-Review: Caleb Guanzon <54fa1f30d451e4f3c341a8f3c47c9215fd0be9c6@instructure.com>
Product-Review: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,sfu/canvas-lms