Always show column headers on result page

Fixes #579

Signed-off-by: Ryan O'Hara <oharar@email.chop.edu>
Wasn't this one of the issues with the previous PR to address this? The columns in Cilantro are not fixed width so resizing them to be fixed width will cause issues for many people in the UI unless their project already explicitly uses fixed width result table columns. I haven't gone all the way through this PR so it might be made clear later but I'm wondering why the width needs to be updated at all if all this is meant to do is to pin the column headers to the top of the results workflow.