修改usps的费率

core/CoreApp/models/Model_usps.php

@@ -303,6 +303,7 @@ function __construct(){
 		}
 		else if($data['js'] == 2)
 		{
+			$rateIndicator = 'PA';
 			$mailClass = 'PRIORITY_MAIL_EXPRESS';
 		}
 		$list['packageDescription']['mailClass'] = $mailClass; // 邮寄类别