Fixes shipping estimate return $0

Orig lines 57-58:
$srcFSA = substr(strtoupper(SHIPPING_ORIGIN_ZIP), 0, 3);
$desFSA = substr(strtoupper($order->delivery['postcode']), 0, 3);

Change to:
$srcFSA = substr(str_replace(" ", "", strtoupper(SHIPPING_ORIGIN_ZIP)), 0, 6);
$desFSA = substr(str_replace(" ", "", strtoupper($order->delivery['postcode'])), 0, 6);


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