test(differential): refresh the fixture -- three more corrections adopted

lectio has taken three further corrections colitur argued from the Missal: the
twelve RG 124 colours (red is for Apostles, Evangelists and Martyrs, and
missalemeum had the rule inverted in both directions), Good Friday's black
under RG 128(b) with RG 132, and RG 72's Christmas Time boundary at 13 January
inclusive.

864 rows changed. Two classes closed outright and two moved:

  C18  450 -> 0    the RG 124 colours -- the LARGEST single class in this file
  C36   46 -> 0    Good Friday's colour
  C1   159 -> 35   the season boundary stopped differing
  C23  184 -> 230  Good Friday's rows fold back, the split no longer needed

C36 is closed rather than kept at zero because the split it represented has
dissolved: it existed only to hold Good Friday apart while its diff set had a
third member, and with the colour agreeing the rows are the exact pair C23 has
always gated on. Restoring 230 is not a regression, it is the number returning
to what it was before the split.

Cited classes 24 -> 19, divergent rows 2252 -> 1521, agreement 86.6% -> 90.9%.

The percentage is again the least interesting part. C18 alone was 450 days on
which the two engines agreed about nothing and now agree because both apply
RG 124 the same way round.

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