Fix lispy-move-down, lispy-move-up for outlines

* lispy.el (lispy--bounds-outline): Replace org-element function with
  the outline one.

In new version of Org mode `org-element-at-point' works only in
Org-like buffers

Author: EugeneNeuron

lispy.el

@@ -6639,7 +6639,9 @@ Otherwise return cons of current string, symbol or list bounds."
              (org-back-to-heading t)
              (point))
            (progn
-             (org-end-of-subtree t t)
+             (outline-mark-subtree)
+             (exchange-point-and-mark)
+             (deactivate-mark)
              (when (and (org-at-heading-p)
                         (not (eobp)))
                (backward-char 1))