Set vehicle interiours to inside, not outside.

map.cpp

@@ -3532,7 +3532,7 @@ void map::build_map_cache(game *g)
   int py = vehs[v].y + vehs[v].v->parts[*part].precalc_dy[0];
   if(INBOUNDS(px, py)) {
    if (vehs[v].v->is_inside(*part)) {
     outside_cache[px][py] = true;
     outside_cache[px][py] = false;
    }
    if (vehs[v].v->part_flag(*part, vpf_opaque) && vehs[v].v->parts[*part].hp > 0) {
     int dpart = vehs[v].v->part_with_feature(*part , vpf_openable);