clear admin todo ignores after resubmission

even if the workflow state didn't change

test plan:
* create an assignment
* submit to the assignment as a student
* as a teacher, clear the needs grading todo list item
 (but don't grade the submission)
* re-submit to the assignment as the same student
* the todo list item should reappear

closes #LS-1489

Change-Id: Ic9dc014cf2edc4a513c511a2ef1d57e3918416c8
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/248185
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Ed Schiebel <eschiebel@instructure.com>
QA-Review: Robin Kuss <rkuss@instructure.com>
Product-Review: James Williams <jamesw@instructure.com>

app/models/submission.rb

@@ -1373,7 +1373,7 @@ def infer_values
       self.quiz_submission ||= Quizzes::QuizSubmission.where(submission_id: self).first
       self.quiz_submission ||= Quizzes::QuizSubmission.where(user_id: self.user_id, quiz_id: self.assignment.quiz).first rescue nil
     end
-    @just_submitted = (self.submitted? || self.pending_review?) && self.submission_type && (self.new_record? || self.workflow_state_changed?)
+    @just_submitted = (self.submitted? || self.pending_review?) && self.submission_type && (self.new_record? || self.workflow_state_changed? || self.attempt_changed?)
     if score_changed? || grade_changed?
       self.grade = assignment ?
         assignment.score_to_grade(score, grade) :