bot: fix undefined variable problem

PHP Notice:  Undefined variable: my_order in /home/acelan/litecoin/bot/cryptsy_bot/cryptsy_bot.php on line 52
PHP Notice:  Undefined variable: cur_price in /home/acelan/litecoin/bot/cryptsy_bot/cryptsy_bot.php on line 55
PHP Notice:  Undefined variable: cur_price in /home/acelan/litecoin/bot/cryptsy_bot/cryptsy_bot.php on line 60

Signed-off-by: AceLan Kao <acelan@acelan.idv.tw>