message: Fix the ability to remove avatar from a space via settings
diff: @@ -73,9 +73,13 @@ const SpaceSettingsDialog: React.FC<IProps> = ({ matrixClient: cli, space, onFin
  const promises = [];
  if (avatarChanged) {
  + if (newAvatar) {
  promises.push(cli.sendStateEvent(space.roomId, EventType.RoomAvatar, {
  url: await cli.uploadContent(newAvatar),
  }, ""));
  + } else {
  + promises.push(cli.sendStateEvent(space.roomId, EventType.RoomAvatar, {}, ""));
  + }
  }
  if (nameChanged) {
  