Qt: rm gossip menu item: already available in toolbar, and channel_db is not always present

electrum/gui/qt/main_window.py

@@ -743,7 +743,6 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
             tools_menu.addAction(_("Electrum preferences"), self.settings_dialog)
 
         tools_menu.addAction(_("&Network"), self.gui_object.show_network_dialog).setEnabled(bool(self.network))
-        tools_menu.addAction(_("&Lightning Gossip"), self.gui_object.show_lightning_dialog).setEnabled(bool(self.wallet.has_lightning() and self.network))
         tools_menu.addAction(_("Local &Watchtower"), self.gui_object.show_watchtower_dialog).setEnabled(bool(self.network and self.network.local_watchtower))
         tools_menu.addAction(_("&Plugins"), self.plugins_dialog)
         tools_menu.addSeparator()