fix(VField): ensure label is reversed when reverse prop is used

[yuwu9145]

Fixes the issue that labels are not reversed when reverse prop is used.

It happens to "underlined" & "outlined" variants as their labels are inside "v-field__outline"

Markup:

<template>
  <v-app>
    <v-container>
      <v-text-field
        label="File input"
        reverse
        variant="underlined"
        model-value="test"
      />
      <v-text-field
        label="File input"
        reverse
        variant="outlined"
        model-value="test"
      />
      <v-text-field
        label="File input"
        reverse
        variant="filled"
        model-value="test"
      />
      <v-text-field
        label="Solo"
        reverse
        variant="solo"
        model-value="test"
      />
    </v-container>
  </v-app>
</template>