Make differentialRevisionListView always have the no data string be "No revisions found."

Summary: the existing, more custom text doesn't make sense when viewing someone else's revisions AND in someplaces its the less interesting "no data found".

Test Plan: clicked around the various http://phabricator.dev/differential/filter/* pages with various users.

Reviewers: epriestley, ry

Reviewed By: epriestley

CC: aran, Koolvin

Maniphest Tasks: T1222

Differential Revision: https://secure.phabricator.com/D2475