Always show column headers on result page

Fixes #579

Signed-off-by: Ryan O'Hara <oharar@email.chop.edu>
Is there any reason for this assignment here? Couldn't tis `onRender` method be reduced to the following now that `onPageScroll` has been removed:

```javascript
this.ui.navbar.css('top', $('.navbar-fixed-top').height());
this.ui.navbar.addClass('navbar-fixed-top');
```