style: Fix the legacy value of justify-items propagation.
style: Fix the legacy value of justify-items propagation.

That property is pretty sad :(

MozReview-Commit-ID: GaKYvqR19M4
Signed-off-by: Emilio Cobos Álvarez <86fa523305b8ad6a8a853c04cfef24a0445908d3@crisal.io>

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