org-agenda.el (org-cmp-ts): Fix bug

* org-agenda.el (org-cmp-ts): Fix bug: interpret `late' as
`later than any date' instead of `later than today'.

Thank to Michael Crouch for reporting this and to Michael Hoffman for
providing the fix.

lisp/org-agenda.el

@@ -7003,7 +7003,7 @@ When TYPE is \"scheduled\", \"deadline\", \"timestamp\" or
 \"timestamp_ia\", compare within each of these type.  When TYPE
 is the empty string, compare all timestamps without respect of
 their type."
-  (let* ((def (if org-sort-agenda-notime-is-late 9901 -1))
+  (let* ((def (if org-sort-agenda-notime-is-late most-positive-fixnum -1))
 	 (ta (or (and (string-match type (or (get-text-property 1 'type a) ""))
 		      (get-text-property 1 'ts-date a)) def))
 	 (tb (or (and (string-match type (or (get-text-property 1 'type b) ""))