message: style(Image): adjust icon color to
diff: @image-placeholder-font-size: @font-size-md;
  @image-placeholder-background-color: @background-color;
  @image-loading-icon-size: 32px;
  -@image-loading-icon-color: @gray-3;
  +@image-loading-icon-color: @gray-4;
  @image-error-icon-size: 32px;
  -@image-error-icon-color: @gray-3;
  +@image-error-icon-color: @gray-4;
  // ImagePreview
  @image-preview-index-text-color: @white;
  