message: WriteBarIcon: add button's border-radius
  to make our outlines pretty
diff: height: 52px;
  width: 44px;
  cursor: pointer;
  + border-radius: 8px;
  }
  .WriteBarIcon__in {
  */
  .WriteBarIcon--ios {
  color: var(--writebar_icon);
  + border-radius: 10px;
  }
  .WriteBarIcon--ios.WriteBarIcon--send:not(:disabled) {
  .WriteBarIcon--ios.WriteBarIcon--done:last-child {
  margin-right: -4px;
  }
  +
  +/**
  + * VKCOM
  + */
  +.WriteBarIcon--vkcom {
  + color: var(--writebar_icon);
  + border-radius: 4px;
  +}
  