message: fix(SubnavigationButton): change selected token
  fixes
diff: */
  .SubnavigationButton--selected {
  - background-color: var(--vkui--color_background_accent);
  + background-color: var(--vkui--color_background_accent_themed);
  color: var(--vkui--color_text_contrast);
  box-shadow: none;
  border: none;
  