fix: ignore click outside if component is being destroyed

[KaelWD]

fixes #6976

Markup:

<template>
  <div class="text-center">
    <v-menu offset-y v-if="$route.name === 'Page 1'">
      <template v-slot:activator="{ on }">
        <v-btn
          color="primary"
          dark
          v-on="on"
        >
          Dropdown
        </v-btn>
      </template>
      <v-list>
        <v-list-item
          v-for="(item, index) in items"
          :key="index"
          @click=""
        >
          <v-list-item-title>{{ item.title }}</v-list-item-title>
        </v-list-item>
      </v-list>
    </v-menu>
    <v-btn to="/page2">go</v-btn>
    <v-btn to="/page1">go</v-btn>
  </div>
</template>

<script>
  export default {
    data: () => ({
      items: [
        { title: 'Click Me' },
        { title: 'Click Me' },
        { title: 'Click Me' },
        { title: 'Click Me 2' },
      ],
    }),
  }
</script>