Do not display the warning about static backups in init_lightning. It is not useful to display the same message twice.

electrum/gui/kivy/main_window.py

@@ -1416,7 +1416,9 @@ class ElectrumWindow(App, Logger):
         elif self.wallet.can_have_lightning():
             root.dismiss()
             if self.wallet.can_have_deterministic_lightning():
-                msg = messages.MSG_LIGHTNING_SCB_WARNING + "\n" + _("Create lightning keys?")
+                msg = _(
+                    "Lightning is not enabled because this wallet was created with an old version of Electrum. "
+                    "Create lightning keys?")
             else:
                 msg = _(
                     "Warning: this wallet type does not support channel recovery from seed. "

electrum/gui/qt/main_window.py

@@ -2386,7 +2386,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
     def init_lightning_dialog(self, dialog):
         assert not self.wallet.has_lightning()
         if self.wallet.can_have_deterministic_lightning():
-            msg = messages.MSG_LIGHTNING_SCB_WARNING + "\n" + _("Create lightning keys?")
+            msg = _(
+                "Lightning is not enabled because this wallet was created with an old version of Electrum. "
+                "Create lightning keys?")
         else:
             msg = _(
                 "Warning: this wallet type does not support channel recovery from seed. "