Fix margins on the change description summary field in changedesc entries.
Review Request #142 — Created Nov. 9, 2016 and updated
The recent CSS cleanup introduced a few small regressions, one of which was the margins on the "Change Summary" field in change description entries on the review request page. This change fixes those up. Testing done: Published an update including a summary, and saw that the layout looked the same as similar multiline text fields within the review request box. Reviewed at https://reviews.reviewboard.org/r/8499/