fix(VCard): set correct radius for direct VAvatar children

[gprst]

Description

A sass rule makes a VAvatar that is the first child of a VCard look weird :

My change makes it back to normal :

It doesn't change modifiers, like tile :

How Has This Been Tested?

I tested it visually. I am not comfortable with unit testing with a Vue framework but am willing to implement unit tests if they are required here, with some direction pointing

Markup:

<template>
  <v-container>
    <v-row>
      <v-card>
        <v-avatar size="40" color="primary">
          <span class="white--text text-h5">A</span>
        </v-avatar>
      </v-card>
    </v-row>
    <v-row>
      <v-card>
        <v-avatar tile size="40" color="primary">
          <span class="white--text text-h5">B</span>
        </v-avatar>
      </v-card>
    </v-row>
    <v-row>
      <v-card>
        <v-avatar rounded size="40" color="primary">
          <span class="white--text text-h5">C</span>
        </v-avatar>
      </v-card>
    </v-row>
  </v-container>
</template>

<script>
  export default {
    data: () => ({
    //
    }),
  }
</script>

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 backwards compatible changes and next for non-backwards compatible 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)

[KaelWD]

This would apply to :last-child as well.

[gprst]

You're right ! Here, done ! I renamed the PR as well, tell me if the name sounds good

[johnleider]

This is working properly in v3 and does not require a port.