[generateGlyph] Don't filter by unicode value
[generateGlyph] Don't filter by unicode value

I really don't think there's any reason for this, except to whittle
down the GPOS table size so that the AFDKO could compile it. Now that
we're using feaLib and don't have this limitation, the filter is
causing more harm than good (lots of glyphs e.g. Cyrillic characters
end up not getting mark attachments when they should).

googlefonts/roboto,anthrotype/roboto,moyogo/roboto,anthrotype/roboto,googlefonts/roboto,moyogo/roboto