test(of): pin the Mary Mother of the Church / Anthony of Padua tie

data/of/amendments/006-mary-mother-of-the-church.sexp's own header
documented, at length, that Easter+50 can land on 13 June and tie with
Anthony of Padua at Tabula III.10 (both universal Memoria_obligatoria)
-- the ledger's remedy (F-MEMORIAL-TIE) asked to document the lacuna
AND pin the current behaviour so it cannot drift silently. Only the
documentation half was done.

Add test_mater_ecclesiae_anthony_tie_2011_known_arbitrary, in the same
style as the Joseph/Palm Sunday and Holy Family fallback pins already
in this file, but labelled KNOWN ARBITRARY rather than KNOWN WRONG:
no rubric decides this collision (the 2018 decree is silent on it, and
Normae n. 14's third clause resolves only the ad-libitum/ad-libitum
case), so colitur's Slug.compare tie-break is a generic kernel
fallback, not a colitur-invented rule. Asserts the 2011 Easter/offset
arithmetic by hand, the current observed slug, and that the loser is
recorded in `omitted` rather than silently dropped.

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