Remove the extra margin above the Unified Banner's changedesc field.
Review Request #13395 — Created Nov. 1, 2023 and submitted
The change description field in the Unified Banner had a bit of extra
margin at the top, due to the default styling of text editors. This
caused the field to jump down a bit when opening, and jump back up when
We now remove that margin, keeping the field's position fixed regardless
of whether it's open or closed.
Edited the field and saw that it no longer jumped.