network: load gossip db early

The gossip db is loaded early when the network is started to save
time when the gui is locked and a wallet not yet loaded. Side effects
of the LNWallet to start peering when a channel db is loaded is
circumvented.

electrum/gui/qt/__init__.py

@@ -208,7 +208,7 @@ class ElectrumGui(Logger):
         self.app.new_window_signal.emit(path, uri)
 
     def show_lightning_dialog(self):
-        if not self.daemon.network.is_lightning_running():
+        if not self.daemon.network.has_channel_db():
             return
         if not self.lightning_dialog:
             self.lightning_dialog = LightningDialog(self)