[fix] fix get_members_count in currency network adapter

"UdAccountsStorage", "CounterForUdAccounts" has been removed from Duniter storage.
"Identity", "CounterForIdentities" is used instead

tikka/adapters/network/currency.py

@@ -108,7 +108,7 @@ class NetworkCurrency(NetworkCurrencyInterface):
 
         try:
             result = self.connections.rpc.client.query(
-                "UdAccountsStorage", "CounterForUdAccounts"
+                "Identity", "CounterForIdentities"
             )
         except Exception as exception:
             logging.exception(exception)