all question types correctly show as unanswered
all question types correctly show as unanswered

fixes QO-497
flag = none

test plan:
 - create a Classic Quiz with every question type
 - uncheck the setting 'Let Students See The Correct Answers'
 - take the quiz without answering any of the questions
 - every question type should correctly show "unanswered"
 - take the quiz again and answer every question incorrectly
 - every question should show as "incorrect" except those
   requiring manual grading

Change-Id: I2bb4067ac6e4235c2e51cc6946c78ef5a27e9465
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/240521
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Han Yan <b20e981b3256dddcc60584d9673f8506dfe8dd0d@instructure.com>
QA-Review: Jared Crystal <06625ed3fabb97fffd807b5fd3c4e9314fe77676@instructure.com>
Product-Review: Matthew Goodwin <7c47e89894930304a2cdfa1d2ccca1e1eddb893d@instructure.com>

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