ob-core.el: Fix indentation of multiline text in list output

* lisp/ob-core.el (org-babel-format-result): Use `org-list-to-org'
instead of `org-list-to-generic' to format result in Org list.

The problem was in formatting a multiline text result into an Org
list.  Additional lines of a list item should be indented with the
first line of the item.  The method used for this
formatting (`org-list-to-generic') does not add the extra indentation
to additional lines of an item.  Using `org-list-to-org' instead fixes
the problem.

TINYCHANGE

lisp/ob-core.el

@@ -2442,7 +2442,7 @@ INFO may provide the values of these header arguments (in the
 		   ((member "list" result-params)
 		    (insert
 		     (org-trim
-		      (org-list-to-generic
+		      (org-list-to-org
 		       (cons 'unordered
 			     (mapcar
 			      (lambda (e)