Fix broken Change Columns button in main toolbar
Fix broken Change Columns button in main toolbar

I'm pretty sure this was broken during the implemenation of the sticky masthead which invalidated the selector. This should be more stable going forward in that it uses just the data-toggle without a class prefix in the selector just like the export button.

chop-dbhi/cilantro,chop-dbhi/cilantro,chop-dbhi/cilantro