"Release comments" button acts on wrong question variant

In some cases the "Release comments" button acts on questions of the wrong variant.

Steps to reproduce:

1. Create an "Interactive Keynote" session
2. Create multiple lecture and prep questions
3. Reload
4. Go to the prep questions panel
5. Lock/unlock all questions by using the "Release comments" button
6. Return to the session overview and open the prep questions panel again All questions should be correctly locked or unlocked based
7. Go to the lecture questions panel and return to the session overview
8. Repeat steps 4-6. This time, the locking state change did not apply to prep questions. Instead it applied to lecture questions.