Fetch multiple UTXOs when we do max_giveable

CHANGELOG.md

@@ -27,6 +27,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   See issues: https://github.com/comit-network/xmr-btc-swap/issues/709 https://github.com/comit-network/xmr-btc-swap/issues/688, https://github.com/comit-network/xmr-btc-swap/issues/701.
 - Add the ability to view the swap-cli bitcoin balance and withdraw
   See issue https://github.com/comit-network/xmr-btc-swap/issues/694
+- An issue where the ASB withdraw one bitcoin UTXO at a time instead of the whole balance.
+  See issue https://github.com/comit-network/xmr-btc-swap/issues/662
 
 ## [0.8.1] - 2021-08-16
 

swap/src/bitcoin/wallet.rs

@@ -400,6 +400,7 @@ where
         let dummy_script = Script::from(vec![0u8; locking_script_size]);
         tx_builder.drain_to(dummy_script);
         tx_builder.fee_rate(fee_rate);
+        tx_builder.drain_wallet();
 
         let response = tx_builder.finish();
         match response {