Fix createdContract in graphql (#1965)

Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/graphql/internal/pojoadapter/TransactionAdapter.java

@@ -144,7 +144,7 @@ public class TransactionAdapter extends AdapterBase {
   public Optional<AccountAdapter> getCreatedContract(final DataFetchingEnvironment environment) {
     final boolean contractCreated = transactionWithMetadata.getTransaction().isContractCreation();
     if (contractCreated) {
-      final Optional<Address> addr = transactionWithMetadata.getTransaction().getTo();
+      final Optional<Address> addr = transactionWithMetadata.getTransaction().contractAddress();
 
       if (addr.isPresent()) {
         final BlockchainQueries query = getBlockchainQueries(environment);

ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/graphql/eth_getTransactionReceipt.json

@@ -9,7 +9,9 @@
           "logsBloom" : "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
         },
         "hash" : "0x812742182a79a8e67733edc58cfa3767aa2d7ad06439d156ddbbb33e3403b4ed",
-        "createdContract" : null,
+        "createdContract" : {
+          "address":"0x6295ee1b4f6dd65047762f924ecd367c17eabf8f"
+        },
         "cumulativeGasUsed" : 493172,
         "gas" : 3141592,
         "gasUsed" : 493172,