Fix breaking interface changing in IRouteThicknessPolicy example implementation in RouteThicknessPolicyExample. The change adds a const FittedRoute& parameter to the scaling method, such that the route segment properties can be inspected when selecting the scale. A potential use case of this is to scale routes which are not fitted to the navigation graph, but leave the routes fitted to a navigation graph as they are (i.e., a scale of 1.f) because the navigation graph widths are known to be correct.