Add 'display:none' to existing page margin box test.
The 'display' property does not apply to page-margin boxes, so
specifying it should have no effect.
See https://drafts.csswg.org/css-page-3/#populating-margin-boxes
Bug: 40341678
Change-Id: Ib21de2c2dd48ca152ff2055b5a0d479b7091e7cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5826482
Reviewed-by: Ian Kilpatrick ikilpatrick@chromium.org
Commit-Queue: Morten Stenshorne mstensho@chromium.org
Cr-Commit-Position: refs/heads/main@{#1349319}