Fix `org-outline-overlay-data' marker insertion-type

* org.el (org-outline-overlay-data): Set the insertion-type of end
bound marker of the function to t (means marker advances when you
insert text at it)

This is to conserve outline visibility property when changes are made
at the end bound of the data.
For example: try `org-babel-execute-subtree' on a folded outline:
The new result will be shown after the folded part of the outline
whereas the outline body should not be visible.

TINYCHANGE

lisp/org.el

@@ -7184,8 +7184,8 @@ If USE-MARKERS is set, return the positions as markers."
 				end (overlay-end o))
 			  (and beg end (> end beg)
 			       (if use-markers
-				   (cons (move-marker (make-marker) beg)
-					 (move-marker (make-marker) end))
+				   (cons (copy-marker beg)
+					 (copy-marker end t))
 				 (cons beg end)))))
 		      (overlays-in (point-min) (point-max))))))))