assume track to be a line when on a closed way

[matkoniecz]

fixes #2698

previously it was assumed to be an area when on closed way, and breaking when tagged as way without having explicit area tag
now it will be assumed to be line, even when on closed way and breaking when tagged as area without having an explicit tag

if SC can detect in quest filter closed ways, maybe adding explicit yes/no can be an useful quest? It can be often done from imagery, but would avoid such confusion within SC itself.

[westnordost]

ok. I read that osm carto does it the same