trustedcoin: fix keystore name (2)

follow-up 56e80c20d7

electrum/plugins/trustedcoin/cmdline.py

@@ -36,7 +36,7 @@ class Plugin(TrustedCoinPlugin):
         if not wallet.can_sign_without_server():
             self.logger.info("twofactor:sign_tx")
             auth_code = None
-            if wallet.keystores['x3/'].can_sign(tx, ignore_watching_only=True):
+            if wallet.keystores['x3'].can_sign(tx, ignore_watching_only=True):
                 msg = _('Please enter your Google Authenticator code:')
                 auth_code = int(input(msg))
             else: