delivery tax fix for Payment Type Charge v1.8 (contrib # 251)

The tax is applied based on the customers primary address, but thats not the osc default behavior.
Osc by default takes the delivery address to apply the taxes.

To achieve this change line 73:
$tod_rate = tep_get_tax_rate(MODULE_FIXED_PAYMENT_CHG_TAX_CLAS S);

to:
$tod_rate = tep_get_tax_rate(MODULE_FIXED_PAYMENT_CHG_TAX_CLAS S, $order->delivery['country']['id'], $order->delivery['zone_id']);


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