remove direction call for sink

Author: duck2

vpr/src/route/sink_sampling.h

@@ -145,9 +145,8 @@ inline void convex_hull_downsample(ParentNetId net_id, const t_bb& net_bb, vtr::
         RRNodeId rr_sink = route_ctx.net_rr_terminals[net_id][i];
         if (!inside_bb(rr_sink, net_bb))
             continue;
-        Direction dir = rr_graph.node_direction(rr_sink);
-        int x = dir == Direction::DEC ? rr_graph.node_xhigh(rr_sink) : rr_graph.node_xlow(rr_sink);
-        int y = dir == Direction::DEC ? rr_graph.node_yhigh(rr_sink) : rr_graph.node_ylow(rr_sink);
+        int x = rr_graph.node_xlow(rr_sink);
+        int y = rr_graph.node_ylow(rr_sink);
         SinkPoint point{x, y, int(i)};
         sink_points.push_back(point);
     }