The fa-check-double icon for correct/incorrect/partial grades were updated
in MDL-82497. However, the UX team has decided to replace these icons with
the following:
- core:i/grade_correct : fa-check-double --> fa-regular fa-circle-check
- core:i/grade_incorrect : fa-xmark --> fa-regular fa-circle-xmark
- core:i/grade_partiallycorrect : fa-check --> fa-circle-half-stroke
These changes should be consistent with the Navigation quiz block too.
