Always show column headers on result page

Fixes #579

Signed-off-by: Ryan O'Hara <oharar@email.chop.edu>
Couldn't this be done with a CSS media query(example [here](https://github.com/cbmi/cilantro/blob/e90313148e52ab72276ae522416deb8509caf38f/src/scss/base/_modal.scss#L37-L61))?