Add sync wallet on nectar's startup

swap/src/bin/nectar.rs

@@ -140,6 +140,12 @@ async fn init_wallets(
         private_key,
     )
     .await?;
+
+    bitcoin_wallet
+        .sync_wallet()
+        .await
+        .expect("Could not sync btc wallet");
+
     let bitcoin_balance = bitcoin_wallet.balance().await?;
     info!(
         "Connection to Bitcoin wallet succeeded, balance: {}",