bug: drop and dropover invalid

[MarTuPoke]

konvajs/konva#1544

[MarTuPoke]

#55

[MarTuPoke]

This is my solution

template:
<v-stage ref="stage"> <v-stage>

script: vue3.2 setup

const stage = ref()
onMounted(() => {
  const con = stage?.value?.getNode()?.container()
  if (con) {
    con.addEventListener('dragover', function (e) {
      e.preventDefault();
    });

    con.addEventListener('drop', function (e) {
      e.preventDefault();
      // TODO do something
    });
  }
})