Lesson header formatting

Found a workaround posted by Tim_ (thanks!)

Lesson Headers may still take up space, inconsistently.

Try this:

1. Go to lesson headers
2. Select a style
3. Set Header Height to small
4. Save
5. Go back to lesson headers
6. say 'Hide Lesson Headers'.
7. The header is gone, but it still takes up the same space. Confirmed true after publishing as well.

Then try this:

1. Go to lesson headers
2. Show the lesson header and change the height to Medium or Large
3. Save
4. Go back to lesson headers
5. say 'Hide Lesson Headers'.
6. The header is gone, and the space is collapsed, as it should be.

It's something funky with styles, because the way they've implemented hiding lesson headers is that the lesson header object still exists in the source of the page, it's just not visible.