fix(VDateInput): do not pass rounded to the picker

[J-Sek]

Description

• noticed by colleague on Discord

Markup:

<template>
  <v-app>
    <v-container>
      <v-select rounded="pill" :items="['item', 'item2', 'item3']" />
      <v-date-input rounded="pill" />
      <v-date-input rounded="xl" />
    </v-container>
  </v-app>
</template>