Add moveBefore() test where box is blockified after move

Missing style recalc after move causes an anonymous block to be inserted as a flex item instead of blockification.

Bug: 482862737 Change-Id: I29f2f9a5d8af2ebd5af61fdefc6d0a7eb21e5ebb Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7557832 Reviewed-by: Morten Stenshorne mstensho@chromium.org Commit-Queue: Rune Lillesveen futhark@chromium.org Cr-Commit-Position: refs/heads/main@{#1581659}