render access/vehicle=forestry/agricultural same as vehicle=privat and vehicle=no

[road-runner-osm]

vehicle/access=forestry and vehicle/access=agricultural are a special case of vehicle/access=private, they only allow certain people to use a track/road.
A driving ban (that only allows agricultural or forestry traffic) actually prohibits normal bikes from using a track/street, so imho it should also be rendered in white.

[Phyks]

The reasoning behind this decision is that usually (in practice) access=forestry|agricultural highways are bikable and most taggers may not realize that such access restriction actually prohibits bicycles from using them. See taginfo for instance where only 17% of access=agricultural has a bicycle=yes indication, which seems way too low.

I'm not aware of any tracks that would be dedicated exclusively for agricultural/forestry vehicles and not accessible for pedestrians/bike. The only case I am aware of are actually access=private tracks (which should be tagged as such).

Happy to reconsider if I'm missing something though.