Fix filtering by reviewer in the issue summary table.
Review Request #7530 — Created July 17, 2015 and submitted
The redesign of the issue summary table had a last-minute change that converted an attribute on an element into a data attribute, and a rename of a function, which broke filtering of reviewers. I've fixed this, and changed an element lookup to use a stored reference to an element for the filter widget.
Tested filtering with two users. "All Users" and each user entry worked
properly.