Use maxDistance passed in to osmIntersection() in turn search

(closes #4844)

The maxDistance was previously hardcoded to 30 meters.
Now we pass it in as a parameter when creating the intersection.
But we need to honor that same maxDistance later when walking the graph
to find turns from.

modules/osm/intersection.js

@@ -387,7 +387,6 @@ export function osmIntersection(graph, startVertexId, maxDistance) {
         // maxViaWay=1   from-*-via-*-to        (1 via max)
         // maxViaWay=2   from-*-via-*-via-*-to  (2 vias max)
         var maxPathLength = (maxViaWay * 2) + 3;
-        var maxDistance = 30;   // meters
         var turns = [];
 
         step(start);