Quiz results: always highlight missed questions

This patch makes the "Let Students See Their Quiz Responses" option not
affect questions that were answered incorrectly from being marked as
such.

Also, in order to preserve the original behavior prior to CNVS-8103,
the question points are now visible regardless of the setting. This
makes sense now since the quiz submission score is already shown, and
the incorrect questions as well.

closes CNVS-10285

TEST PLAN
---- ----

  - Create a quiz with like 3 questions
  - Don't check the "LSSTCA" (yeah!) setting in the quiz settings page
    but check only the "Let Students See Their Quiz Responses"
  - Take it, miss 1 or 2 questions, and verify that:
    1. The questions you missed show the "Incorrect" red marker next
       to their title
    2. The questions show the number of points the student has scored

Change-Id: I24a73837ef18de9937f160752d03a041dea97427
Reviewed-on: https://gerrit.instructure.com/28161
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Myller de Araujo <myller@instructure.com>
Reviewed-by: Derek DeVries <ddevries@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>