FIX: restore np.abs ufunc support for scipy.sparse

(cherry picked from commit 8dadc9cd662a7ed7225c6f4ac2a5e0de8b3ba947)
STY: sparse: rewrite call to abs in __numpy_ufunc__ in a different way

(cherry picked from commit d0d2cf33f393a891fd5ecb580791452898294416)