fix submission html loading when file upload questions are present

Test plan:
  - As a teacher with fabulous quizzes, take a quiz with a file upload
    question. The submission detail view should load at the bottom of
    the overview tab.

fixes CNVS-12813

Change-Id: I40619c8a0b311787062c98d909189d1f7775d0ca
Reviewed-on: https://gerrit.instructure.com/34193
Reviewed-by: Jason Madsen <jmadsen@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Stanley Stuart <stanley@instructure.com>