[triangulation] fix point type alias

dumux/common/geometry/triangulation.hh

@@ -116,7 +116,7 @@ inline Triangulation<dim, dimWorld, typename RandomAccessContainer::value_type::
 triangulate(const RandomAccessContainer& points)
 {
     using ctype = typename RandomAccessContainer::value_type::value_type;
-    using Point = Dune::FieldVector<ctype, 3>;
+    using Point = Dune::FieldVector<ctype, dimWorld>;
 
     static_assert(std::is_same<typename RandomAccessContainer::value_type, Point>::value,
                   "Triangulation expects Dune::FieldVector as point type");