Add additional padding for MSF with external tools
Add additional padding for MSF with external tools

This will allow the external tools to fully show given the
module sequence footer is floating at the bottom now.

closes CNVS-26677

Test Plan:
  - Load up a course with TurnitIn enabled
  - Add an external tool to a module
  - As a student take a look at the module
  - The footer should not cover the "accept/reject" buttons
    for TurnitIn.
    * Note: This must be done at a lower resolution as it doesn't
            affect larger screens since they have plenty of screen
            real estate.

Change-Id: I3ae25cf3cc1e31dfd69cab3246afeaf8eb41aff8
Reviewed-on: https://gerrit.instructure.com/71042
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: Clare Strong <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Tested-by: Jenkins
Product-Review: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>

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