Update BIP39 recovery script to use new xpub API

electrum/scripts/bip39_recovery.py

@@ -6,6 +6,8 @@
 from electrum.util import json_encode, print_msg, create_and_start_event_loop, log_exceptions
 from electrum.simple_config import SimpleConfig
 from electrum.network import Network
+from electrum.keystore import bip39_to_seed
+from electrum.bip32 import BIP32Node
 from electrum.bip39_recovery import account_discovery
 
 try:
@@ -24,7 +26,13 @@
 @log_exceptions
 async def f():
     try:
-        active_accounts = await account_discovery(network, mnemonic, passphrase)
+        def get_account_xpub(account_path):
+            root_seed = bip39_to_seed(mnemonic, passphrase)
+            root_node = BIP32Node.from_rootseed(root_seed, xtype="standard")
+            account_node = root_node.subkey_at_private_derivation(account_path)
+            account_xpub = account_node.to_xpub()
+            return account_xpub
+        active_accounts = await account_discovery(network, get_account_xpub)
         print_msg(json_encode(active_accounts))
     finally:
         stopping_fut.set_result(1)