fix ln payments: set payto_e ln invoice correctly

payto_e.lightning_invoice has to be set after the payment field is set
to the node pub key, because check_text has the side effect of resetting
the payto_e.lightning_invoice

electrum/gui/qt/main_window.py

@@ -1970,7 +1970,6 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
             self.show_error(_("Error parsing Lightning invoice") + f":\n{e}")
             return
 
-        self.payto_e.lightning_invoice = invoice
         pubkey = bh2u(lnaddr.pubkey.serialize())
         for k,v in lnaddr.tags:
             if k == 'd':
@@ -1980,6 +1979,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
              description = ''
         self.payto_e.setFrozen(True)
         self.payto_e.setText(pubkey)
+        self.payto_e.lightning_invoice = invoice
         self.message_e.setText(description)
         if lnaddr.get_amount_sat() is not None:
             self.amount_e.setAmount(lnaddr.get_amount_sat())