Fix off-by-one error in spool handling.

mods/telex/init.lua

@@ -342,13 +342,13 @@ function telex.process_spool()
 		msg.age = msg.age - 3600
 		if msg.age < 0 then
 			old[#old + 1] = k
-			table.insert(del, msgid)
+			del[#del + 1] = msgid
 		end
 		telex.save_msg(msgid, msg)
 	end
 
 	-- remove old msgs from spool
-	for i = #old + 1, 1, -1 do
+	for i = #old, 1, -1 do
 		table.remove(spool, old[i])
 	end
 	S:set_string("telex_spool", telex.encode(spool))