R1:a5f62235537d

Show blame colors on all lines, instead of only the first affected line

Summary: Fixes T10226. I just made a mistake here when rewriting this recently.

Test Plan: {F1079166}

Reviewers: chad, avivey

Reviewed By: avivey

Maniphest Tasks: T10226

Differential Revision: https://secure.phabricator.com/D15131