fix(VDataTable): hide default body

[MajesticPotatoe]

Description

Brings back ability to replace the default tbody
resolves #18854

Markup:

<template>
  <v-data-table
    hide-default-body
    :items="[
      { id: 1, text: '1' },
      { id: 2, text: '2' },
    ]"
  >
    <template #tbody="{ items }">
      <tbody>
        <tr v-for="item in items" :key="item.id">
          <td>{{ item.id }}</td>
          <td>{{ item.text }}</td>
        </tr>
      </tbody>
    </template>
  </v-data-table>
</template>