Allow wallets to use non-deterministic lightning,

if they use a software keystore.

This excludes hardware wallets and watching-only wallet.
Also, this forbids creation of new channels in those wallets,
in case lightning was previously enabled.

Fixes #9440

electrum/gui/qml/components/Channels.qml

@@ -134,7 +134,7 @@ Pane {
             FlatButton {
                 Layout.fillWidth: true
                 Layout.preferredWidth: 1
-                enabled: Daemon.currentWallet.confirmedBalance.satsInt > 0
+                enabled: Daemon.currentWallet.canHaveLightning && Daemon.currentWallet.confirmedBalance.satsInt > 0
                 text: qsTr('Open Channel')
                 onClicked: {
                     if (Daemon.currentWallet.channelModel.count == 0) {

electrum/gui/qt/channels_list.py

@@ -368,7 +368,7 @@ class ChannelsList(MyTreeView):
         #     and maybe add item "main_window.init_lightning_dialog()" when applicable
         menu.setEnabled(self.wallet.has_lightning())
         self.new_channel_button = EnterButton(_('New Channel'), self.main_window.new_channel_dialog)
-        self.new_channel_button.setEnabled(self.wallet.has_lightning())
+        self.new_channel_button.setEnabled(self.wallet.can_have_lightning())
         toolbar.insertWidget(2, self.new_channel_button)
         return toolbar