PP-13622 Fix incorrect negation for won disputes in CSV files

With this change, we are fixing a bug for which disputed amounts are shown as
negative numbers in the CSV files.

The logic will now consider also the state of the dispute and present the
value as positive when the dispute has been won by the service.

Further information in Jira.

https://payments-platform.atlassian.net/browse/PP-13622

Author: marcotranchino

src/main/java/uk/gov/pay/ledger/transaction/model/CsvTransactionFactory.java

@@ -31,6 +31,7 @@
 import static org.apache.commons.text.WordUtils.capitalizeFully;
 import static uk.gov.pay.ledger.transaction.model.TransactionType.DISPUTE;
 import static uk.gov.pay.ledger.transaction.model.TransactionType.REFUND;
+import static uk.gov.pay.ledger.transaction.state.TransactionState.WON;
 import static uk.gov.pay.ledger.util.JsonParser.safeGetAsBoolean;
 import static uk.gov.pay.ledger.util.JsonParser.safeGetAsLong;
 import static uk.gov.pay.ledger.util.JsonParser.safeGetAsString;
@@ -154,7 +155,10 @@ public Map<String, Object> toMap(TransactionEntity transactionEntity) {
                         getPaymentTransactionAttributes(transactionEntity, transactionDetails.get("payment_details"))
                 );
                 result.put(FIELD_GOVUK_PAYMENT_ID, transactionEntity.getParentExternalId());
-                result.put(FIELD_AMOUNT, penceToCurrency(transactionEntity.getAmount() * -1));
+                boolean isRefundOrNotWonDispute= transactionEntity.getState() != WON;
+                if (isRefundOrNotWonDispute) {
+                    result.put(FIELD_AMOUNT, penceToCurrency(transactionEntity.getAmount() * -1));
+                }
             }
 
             result.put(FIELD_PROVIDER_ID, sanitiseAgainstSpreadsheetFormulaInjection(transactionEntity.getGatewayTransactionId()));