Fix wrong function calls

When I changed `unpackaged/org-element-descendent-of' to
`acdw-org/element-descendent-of' (honestly, to make it easier to see where the
definition of the function is), I didn't change all the references to that
function.

lisp/acdw-org.el

@@ -27,7 +27,7 @@ ELEMENT should be a list like that returned by `org-element-context'."
   ;; MAYBE: Use `org-element-lineage'.
   (when-let* ((parent (org-element-property :parent element)))
     (or (eq type (car parent))
-        (unpackaged/org-element-descendant-of type parent))))
+        (acdw-org/element-descendant-of type parent))))
 
 (defun acdw-org/return-dwim (&optional default)
   "A helpful replacement for `org-return'.  With prefix, call `org-return'.
@@ -241,6 +241,6 @@ the deletion might narrow the column."
   (interactive "p")
   (if (org-table-check-inside-data-field 'noerror)
       (org-table-copy-down n)
-    (unpackaged/org-return-dwim n)))
+    (acdw-org/return-dwim n)))
 
 (provide 'acdw-org)