dont divide area by 10 when adding polygons - not sure why this was e…

…ven there. Also catch a bug which hasnt surfaced so far: when area is not used, still compute if for the box id intersection test

src/spatialjoin/Sweeper.cpp

@@ -93,11 +93,12 @@ void Sweeper::add(const util::geo::I32Polygon& poly, const std::string& gid,
                   size_t subid) {
   const auto& box = util::geo::getBoundingBox(poly);
   const I32XSortedPolygon spoly(poly);
-  double areaSize = 0;
-  if (_cfg.useArea) areaSize = util::geo::area(poly) / 10.0;
+  double areaSize = util::geo::area(poly);
   BoxIdList boxIds;
   if (_cfg.useBoxIds) boxIds = packBoxIds(getBoxIds(spoly, poly, box, areaSize));
 
+  if (!_cfg.useArea) areaSize = 0;
+
   size_t id = _areaCache.add(Area{
       spoly,
       box,