message: add back filter-list global CSS inject
diff: import React from 'react'
  import PropTypes from 'prop-types'
  import classnames from 'classnames'
  +import sass from 'sass.macro'
  +import {injectGlobal} from 'emotion'
  import {withSystemProps, COMMON} from './system-props'
  +injectGlobal(sass`
  + @import "primer-support/index.scss";
  + @import "primer-navigation/lib/filter-list.scss";
  +`)
  +
  export const ITEM_CLASS = 'filter-item'
  export const SELECTED_CLASS = 'selected'
  