Fix problems with disputed boundaries from RAWR tiles
Fix problems with disputed boundaries from RAWR tiles

1. The code was dropping all linestrings. This used to be the correct behaviour, but now claims and disputes are included as line features and these should not be dropped any more.
2. After converting from the polygon to the boundary, the `mz_boundary_from_polygon` flag was being set on the wrong set of properties. This caused a downstream process to explode, since the feature no longer matched any of the YAML rules.

tilezen/tilequeue