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The test:
  fast/borders/border-image-border-radius.html
should apply line-height quriks, but crbug.com/40634 prevents
applying it in legacy, but LayoutNG considers it's quirks.

This patch changes the test to the standard mode, so that the
rendering matches without crbug.com/40634.

TBR=eae@chromium.org

Bug: 636993
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: Ifb5c2152f344f5c8d3b1cf54379107c631857952
Reviewed-on: https://chromium-review.googlesource.com/1146880Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577498}