bridge-proxy:Only failed transactions are returned

On the callback only in case of error should the transaction be
added to eth_failed_transaction_list.

bridge-proxy/src/bridge-proxy.rs

@@ -46,8 +46,17 @@ pub trait BridgeProxyContract: config::ConfigModule {
     }
 
     #[callback]
-    fn failed_execution_callback(&self, tx: &EthTransactionPayment<Self::Api>) {
-        self.eth_failed_transaction_list().push_back(tx.clone());
+    fn failed_execution_callback(
+        &self,
+        #[call_result] result: ManagedAsyncCallResult<()>,
+        tx: &EthTransactionPayment<Self::Api>,
+    ) {
+        match result {
+            ManagedAsyncCallResult::Ok(_) => {}
+            ManagedAsyncCallResult::Err(_) => {
+                self.eth_failed_transaction_list().push_back(tx.clone());
+            }
+        }
     }
 
     #[endpoint(refundTransactions)]