fix style check errors

Author: bipashabg

src/ordering/ordering_driver.cpp

@@ -90,10 +90,10 @@ do_ordering(
         std::vector<int64_t> results;
 
 #if 0
-	pgrouting::UndirectedGraph undigraph;
+        pgrouting::UndirectedGraph undigraph;
 #else
-	auto vertices(pgrouting::extract_vertices(edges));
-	pgrouting::UndirectedGraph undigraph(vertices);
+        auto vertices(pgrouting::extract_vertices(edges));
+        pgrouting::UndirectedGraph undigraph(vertices);
 #endif
         undigraph.insert_edges(edges);