Saving questions doesn't save exercises

[MCGallaspy]

On master, if you edit & save a question under an exercise, but then fail to additionally save the exercise, then your changes to the question will not by synced. If you e.g. navigate away and then back to the exercise without saving after editing a question, your changes will be lost.

Expected behavior: clicking the save icon for a question should sync the changes to that question without having to click the save button for that exercises. Alternatively, we should cue to users that it's necessary to click the save button for the exercise after changes have been made to a question.