Wrong to_strides_v computation

[amitsingh19975]

The strides giving wrong strides for static extents, which is not consistent with the other extents types.

    namespace ublas = boost::numeric::ublas;
    using e_t = ublas::extents<2,2>;
    auto s = to_strides_v<e_t, ublas::layout::first_order>; // [1,2], but the right strides should be [1,1]