This removes a rule that was incorrectly added in the tests in patch 3,
which dholbert pointed out in a review comment (comment 18) made after
granting review (and only 3 minutes before I pushed the patches), which
I didn't see before pushing them.
I had incorrectly copied that rule from the
min-intrinsic-with-percents-across-elements.html test, which I based
these on.
MozReview-Commit-ID: IARSYkKkIRx
