Missing bullet delimiter in waterway labels

[1ec5]

This river straddles the border between North and South Korea; the two countries have different Korean-language names for the same river. The style shows both names, attempting to replace the semicolon delimiter with a newline. However, MapLibre GL JS doesn’t support newlines in line-placed labels, since they wouldn’t have text-max-width set: mapbox/mapbox-gl-js#8575. So instead it smooshes the two names together:

That might not be so weird in CJK, but in other scripts that routinely separate words with spaces, users might be expecting something more explicit to separate the names, as in this river:

In #666, I implemented a bullet character as the delimiter in line-placed transportation labels, but I overlooked the fact that waterway labels are also line-placed.