message: utils: Update messageBoxChecked to use bool directly, no local copy
diff: @@ -448,7 +448,6 @@ QMessageBox::StandardButton RDDialog::messageBoxChecked(QMessageBox::Icon icon,
  QMessageBox::StandardButtons buttons,
  QMessageBox::StandardButton defaultButton)
  {
  - bool isChecked = checked;
  QMessageBox::StandardButton ret = defaultButton;
  // if we're already on the right thread, this boils down to a function call
  @@ -457,11 +456,10 @@ QMessageBox::StandardButton RDDialog::messageBoxChecked(QMessageBox::Icon icon,
  mb.setDefaultButton(defaultButton);
  mb.setCheckBox(checkBox);
  show(&mb);
  - isChecked = mb.checkBox()->isChecked();
  + checked = mb.checkBox()->isChecked();
  ret = mb.standardButton(mb.clickedButton());
  });
  - checked = isChecked;
  return ret;
  }
  