device manager: index devices by xpub

plugins/ledger/__init__.py

@@ -3,6 +3,5 @@ from electrum.i18n import _
 fullname = 'Ledger Wallet'
 description = 'Provides support for Ledger hardware wallet'
 requires = [('btchip', 'github.com/ledgerhq/btchip-python')]
-#requires_wallet_type = ['btchip']
 registers_keystore = ('hardware', 'btchip', _("Ledger wallet"))
 available_for = ['qt', 'cmdline']