Increase CSS specificity on Inline Comment Summary
Summary: Fixes T8354. Adds a class to each th and td for specificity.
Test Plan: Write a large table as an inline comment, see it wraps property on smaller screens.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T8354
Differential Revision: https://secure.phabricator.com/D13076