eja mater: use awkward notation from finale sample

In the finale version, on which i based this one,
there were two awkward things:
- dotted notes that crossed 3rd beat and looked very confusing
  (it's more readable to split such notes using ties),
- divisi altos and tenors that were notated as separate voices
  (they were in rhythmic unison, so it's enough to use chords).

I've corrected these engraving mistakes when i imported
the piece to LilyPond, but it's useful to have a version
with them for comparisons' sake.  This commit restores them.
eja mater: fix finale-adapted version

changing some notation to what was used in the Finale version
had some unwanted side-effects. This commit corrects these.