test(ef): pin the overlay suppression's own observable effect

With data/ef/adjustments.sexp's one Suppress directive replaced by an
empty directive list, colitur day 2026's stdout was byte-identical for
all 365 days and the whole suite still passed: ef-nativity-vigil already
outranks vigil-of-christmas in the RG91 contest regardless of whether
the overlay ever ran, so the suppression's only observable effect is
keeping vigil-of-christmas out of 24 December's Liturgical_day.omitted
-- a field no cram assertion reads. test/dune's own dep on
adjustments.sexp pinned the file's existence, never its content.

Confirmed the gap two ways: reverting the overlay to (directives ())
makes this new test fail (24 December's omitted gains
vigil-of-christmas), and confirmed test/cli.t's whole cram suite still
passes under that same mutation -- cram is structurally blind to this,
not merely undertested.

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