always show advanced assignment edit options

fixes CNVS-10386

note: this is based on liz's commit so some css/styling will be different

test plan:
  - go to assignment edit page
  - edit all options
  - ensure options save as intended

Change-Id: I1a1bc04b60d626c598eb32ade08d65f75cdf3078
Reviewed-on: https://gerrit.instructure.com/29343
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Mike Nomitch <mnomitch@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Mike Nomitch <mnomitch@instructure.com>