Fix the recovery of a descriptor given a PSBT

This commit upgrades `rust-miniscript` with a fix to only return the prefix that
matches a `hd_keypath` instead of the full derivation path, and then adapts the
signer code accordingly.

This commit closes #108 and #109.

src/wallet/mod.rs

@@ -2404,6 +2404,21 @@ mod test {
         assert_eq!(extracted.input[0].witness.len(), 2);
     }
 
+    #[test]
+    fn test_sign_single_xprv_bip44_path() {
+        let (wallet, _, _) = get_funded_wallet("wpkh(tprv8ZgxMBicQKsPd3EupYiPRhaMooHKUHJxNsTfYuScep13go8QFfHdtkG9nRkFGb7busX4isf6X9dURGCoKgitaApQ6MupRhZMcELAxTBRJgS/44'/0'/0'/0/*)");
+        let addr = wallet.get_new_address().unwrap();
+        let (psbt, _) = wallet
+            .create_tx(TxBuilder::with_recipients(vec![(addr.script_pubkey(), 0)]).send_all())
+            .unwrap();
+
+        let (signed_psbt, finalized) = wallet.sign(psbt, None).unwrap();
+        assert_eq!(finalized, true);
+
+        let extracted = signed_psbt.extract_tx();
+        assert_eq!(extracted.input[0].witness.len(), 2);
+    }
+
     #[test]
     fn test_sign_single_xprv_sh_wpkh() {
         let (wallet, _, _) = get_funded_wallet("sh(wpkh(tprv8ZgxMBicQKsPd3EupYiPRhaMooHKUHJxNsTfYuScep13go8QFfHdtkG9nRkFGb7busX4isf6X9dURGCoKgitaApQ6MupRhZMcELAxTBRJgS/*))");