Add overflow: hidden back to obj-list
Summary: Long titles tend to break some of the layout. I removed this fixing another bug, but ultimately we changed directions on boards and it doesn't repro anymore.
Test Plan: Test workboards with tasks on and off the screen. All are drawn. Test the homepage with lots of overflowing information. Make sure objects don't break the 'card'.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9020