fix double quotes in f-string

Author: kratm2

electrum/gui/qt/transaction_dialog.py

@@ -403,7 +403,7 @@ def on_context_menu_for_outputs(self, pos: QPoint):
         if addr := out.address:
             if self.wallet.is_mine(addr):
                 show_list += [(_("Address Details"), lambda: self.main_window.show_address(addr, parent=self))]
-            copy_list += [(_(f"Copy {"On Chain " if out.is_silent_payment() else ""}Address"),
+            copy_list += [(_(f"Copy {'On Chain ' if out.is_silent_payment() else ''}Address"),
                            lambda: self.main_window.do_copy(addr))]
         if out.is_silent_payment():
             copy_list += [(_("Copy Silent Payment Address"), lambda: self.main_window.do_copy(out.sp_addr.encoded))]