Make this code handling spool identical to the other section.

mods/telex/init.lua

@@ -303,19 +303,19 @@ minetest.register_on_joinplayer(function(player)
 	local name = player:get_player_name()
 
 	-- deliver items for this player
-	local nos = {}
+	local old = {}
 	local del = {}
 	for k, msgid in pairs(spool) do
 		local msg = telex.get_msg(msgid)
 		if msg.to == name then
-			table.insert(nos, k)
-			table.insert(del, msgid)
+			old[#old + 1] = k
+			del[#del + 1] = msgid
 		end
 	end
 
 	-- remove items from spool in reverse order
-	for i = #nos, 1, -1 do
-		table.remove(spool, nos[i])
+	for i = #old, 1, -1 do
+		table.remove(spool, old[i])
 	end
 	S:set_string("telex_spool", telex.encode(spool))