fix(VDateInput): inherit class

[SonTT19]

Description

fixes #19985

Markup:

<template>
  <v-app>
    <v-container>
      <v-date-input class="custom-date-input-class" variant="outlined" />

      <v-date-input :style="{ background: 'pink' }" variant="outlined" />
    </v-container>
  </v-app>
</template>

<style scoped>
  .custom-date-input-class {
    background: green;
  }
</style>

[johnleider]

If we're adding class we should probably add style as well.