Remove logic which hides commit names in commit table when they're the same as previous commit names

Summary:
See discussion in T2832. In particular, this is pretty confusing:

{F38674}

The confusion created in situations like this is much worse than the tiny benefit in parseability the UI rule provides. We'll probably rewrite this table in terms of ObjectListView anyway.

Fixes T2832.

Test Plan: Looked at Audit list.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2832

Differential Revision: https://secure.phabricator.com/D5610