Style OSM turn restrictions better

[planemad]

Showing existing OSM turn restrictions on the map help to easily compare with Mapillary restrictions and add/update the data onto the map.

_Current styling of OSM turn restriction `from` `via` and `to` members in red_

@rasagy can you review the issues with this styling from a reviewer perspective and post your notes on how it should ideally look?

cc @andreasviglakis