message: Fix border color of input group select accessory when disabled
diff: .boxel-input-group--disabled .boxel-input-group__form-control,
  .boxel-input-group--disabled .boxel-input-group__text-accessory,
  .boxel-input-group--disabled .boxel-input-group__icon-button-accessory,
  -.boxel-input-group--disabled .boxel-input-group__button-accessory {
  +.boxel-input-group--disabled .boxel-input-group__button-accessory,
  +.boxel-input-group--disabled .boxel-input-group__select-accessory {
  border-color: var(--boxel-input-group-border-color);
  color: rgb(0 0 0 / 50%);
  opacity: 0.5;
  