fix(VCalendar): hide adjacent events when not using show-adjacent-months

[nekosaur]

Description

we should not show events on adjacent days unless show-adjacent-months is used

Markup:

<template>
  <v-app>
    <v-container>
      <v-calendar
        v-model="date"
        :events="events"
      />
    </v-container>
  </v-app>
</template>

<script>
  import { ref } from 'vue'
  export default {
    name: 'Playground',
    setup () {
      const date = ref([new Date(2024, 3, 1)])
      return {
        date,
        events: [
          {
            start: new Date(2024, 3, 1),
            end: new Date(2024, 3, 1),
            title: 'foo',
          },
          {
            start: new Date(2024, 4, 1),
            end: new Date(2024, 4, 1),
            title: 'bar',
          },
        ],
      }
    },
  }
</script>