fix(VDivider): missing rtl styles

[jacekkarczmarczyk]

Motivation and Context

fixes #8397

How Has This Been Tested?

visually

Markup:

<template>
  <v-container>
    <v-btn block @click="$vuetify.rtl = !$vuetify.rtl">{{ $vuetify.rtl ? 'rtl' : 'ltr' }}</v-btn>
    <v-list shaped>
      <v-list-item>
        <v-list-item-icon>
          <v-icon>mdi-view-dashboard</v-icon>
        </v-list-item-icon>
        <v-list-item-content>
          <v-list-item-title>Test</v-list-item-title>
        </v-list-item-content>
      </v-list-item>
      <v-divider inset />
    </v-list>
  </v-container>
</template>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and breaking changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)
• I've added new examples to the kitchen (applies to new features and breaking changes in core library)