Fix up the ora2 scores affected by the track changes bug.

  For affected assessments:
    - Sets PeerWorkflowItem.scored = 0 if currently = 1
    - Recalculates the score for the submission
    - If new score > old score, update the Score.points_earned with the new score
Couldn't you say here:
```update_score(owner_submission_uuid, max(new_generated_score, points_earned), points_earned)```
and not require the surrounding comments and tests?