message: FormLayoutGroup: add removable
diff: -.FormLayoutGroup--horizontal {
  +.FormLayoutGroup--horizontal .FormLayoutGroup__children {
  flex-direction: row;
  display: flex;
  }
  -.FormLayoutGroup--horizontal > .FormItem {
  +.FormLayoutGroup--horizontal .FormLayoutGroup__children > .FormItem {
  max-width: 100%;
  flex-grow: 1;
  flex-shrink: 0;
  min-width: 0;
  }
  -.FormLayoutGroup--horizontal > .FormItem + .FormItem {
  +.FormLayoutGroup--horizontal .FormLayoutGroup__children > .FormItem + .FormItem {
  margin-left: 24px;
  }
  +.FormLayoutGroup--horizontal {
  + padding-left: 16px;
  + padding-right: 16px;
  +}
  +
  +/**
  + * iOS
  + */
  +
  .FormLayoutGroup--ios.FormLayoutGroup--horizontal {
  padding-left: 12px;
  + padding-right: 0;
  +}
  +
  +.FormLayoutGroup--ios.FormLayoutGroup--horizontal .Removable {
  + margin-left: -12px;
  + padding-left: 12px;
  +}
  +
  +.FormLayoutGroup--ios.FormLayoutGroup--horizontal .FormLayoutGroup__children {
  padding-right: 12px;
  }
  -.FormLayoutGroup--android.FormLayoutGroup--horizontal,
  -.FormLayoutGroup--vkcom.FormLayoutGroup--horizontal {
  - padding-left: 16px;
  - padding-right: 16px;
  +.FormLayoutGroup--ios.FormLayoutGroup--offset .Removable__remove-marker {
  + margin-top: 26px;
  +}
  +
  +/**
  + * ANDROID & VKCOM
  + */
  +
  +.FormLayoutGroup--android .Removable__remove,
  +.FormLayoutGroup--vkcom .Removable__remove {
  + margin-right: -16px;
  +}
  +
  +.FormLayoutGroup--android.FormLayoutGroup--sizeY-compact .Removable__remove,
  +.FormLayoutGroup--vkcom.FormLayoutGroup--sizeY-compact .Removable__remove {
  + margin-left: 2px;
  + margin-right: -14px;
  +}
  +
  +.FormLayoutGroup--android.FormLayoutGroup--offset .Removable__remove,
  +.FormLayoutGroup--vkcom.FormLayoutGroup--offset .Removable__remove {
  + margin-top: 26px;
  }
  