[Controls Refresh] Rebaseline select-dark-mode-basic.html for legacy

The test was failing in legacy layout.

BUG=929098

Change-Id: Ic96be044bfe1483c505ab38b44f87ce68dd7a045
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094992
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#748618}