message: WriteBar: remove empty rules from css
diff: * iOS
  */
  -.WriteBar--ios {
  -
  -}
  -
  .WriteBar--ios .WriteBar__before,
  .WriteBar--ios .WriteBar__after {
  padding: 0 4px;
  * Android + vkcom
  */
  -.WriteBar--android,
  -.WriteBar--vkcom {
  -
  -}
  -
  .WriteBar--android .WriteBar__before,
  .WriteBar--vkcom .WriteBar__before {
  padding-left: 4px;
  