message: IconButton: update border-radius to 50%
diff: .IconButton--android,
  .IconButton--vkcom {
  height: 48px;
  - border-radius: 24px;
  + border-radius: 50%;
  }
  .IconButton--android.Tappable--sizeY-compact,
  .IconButton--vkcom.Tappable--sizeY-compact {
  height: 44px;
  - border-radius: 22px;
  }
  .IconButton--android.Tappable--active .Icon,
  