Fix off-by-one error in message selection.
Closes
(sh-lame "{(scow %s (new:si | +(num)))}: no such telegram")
=. ..sh-fact (sh-fact %txt "? {(scow %s (new:si | +(num)))}")
(activate (snag num grams))
- ?. (gth q.num count)
+ ?. (gte q.num count)
?: =(count 0)
(sh-lame "0: no messages")
=+ msg=(deli (dec count) num)
