R1:03a114848065

Restore Maniphest to use comma-style lists for subscribers, projects

Summary: D4153 made these render with newlines between items; use commas instead.

Test Plan: {F26950}

Reviewers: btrahan, chad, vrana

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D4162