message: ModalPageHeader.css: fixed some icons color
diff: padding-left: 4px;
  padding-right: 4px;
  }
  +
  +.ModalPageHeader .Icon--dismiss_24 {
  + color: var(--placeholder_icon_foreground_primary);
  +}
  +
  +.ModalPageHeader .Icon--cancel_24 {
  + color: var(--icon_secondary);
  +}
  