Fix a regression in unit tests for the diff commits list.
Review Request #13341 — Created Oct. 13, 2023 and submitted — Latest diff uploaded
My recent change to the diff commits list introduced new CSS classes for
the column headers. These came with unit test updates for the generated
HTML, which I failed to add to the posted change. That regressed the
test suite.This change adds the missing unit test updates.
Unit tests pass.