Fix current section indenting.

Fixes current section indenting:

![2014-04-08 11_40_35-course_ document](https://cloud.githubusercontent.com/assets/1058419/2642702/7caf7c82-bf0d-11e3-9f01-2dd3af8ca6d1.png)

to:

![2014-04-08 11_54_37-course_ document](https://cloud.githubusercontent.com/assets/1058419/2642707/891f8fac-bf0d-11e3-9967-4b6ac474a0ee.png)

My contributed formats already do this!  I looked for a core patch possibility but could not justify as B2.3.2 themes not affected.