CRM-20946, use line total of line itme to store in financial item table

----------------------------------------
* CRM-20946: Wrong entries in financial table when contribution is cancelled
  https://issues.civicrm.org/jira/browse/CRM-20946

CRM/Contribute/BAO/Contribution.php

@@ -5329,7 +5329,7 @@ protected static function getFinancialItemAmountFromParams($params, $context, $l
       if ($isARefund) {
         $cancelledTaxAmount = CRM_Utils_Array::value('tax_amount', $params, '0.00');
       }
-      return self::getMultiplier($params['contribution']->contribution_status_id, $context) * ($params['trxnParams']['total_amount'] + $cancelledTaxAmount);
+      return self::getMultiplier($params['contribution']->contribution_status_id, $context) * ($lineItemDetails['line_total'] + $cancelledTaxAmount);
     }
     elseif ($context === NULL) {
       // erm, yes because? but, hey, it's tested.