message: fix(@vant/use): allow to call useWindowSize outside setup
diff: import { ref, Ref } from 'vue';
  import { inBrowser } from '../utils';
  -import { useEventListener } from '../useEventListener';
  let width: Ref<number>;
  let height: Ref<number>;
  @@ -10,16 +9,16 @@ export function useWindowSize() {
  width = ref(0);
  height = ref(0);
  - const update = () => {
  if (inBrowser) {
  + const update = () => {
  width.value = window.innerWidth;
  height.value = window.innerHeight;
  - }
  };
  update();
  - useEventListener('resize', update);
  - useEventListener('orientationchange', update);
  + window.addEventListener('resize', update, { passive: true });
  + window.addEventListener('orientationchange', update, { passive: true });
  + }
  }
  return { width, height };
  