Fixes disabled styling for v-btn when a color prop is passed in

[rkomiyama]

Description

A check is added to see if the disabled prop has a true value. If so, then the render function will not call setBackgroundColor.

Motivation and Context

See issue here: #5720

How Has This Been Tested?

None.

Markup:

<template>
  <v-app>
    <v-content>
      <v-container grid-list-xl>
        <v-btn icon>
          <v-icon>print</v-icon>
        </v-btn>
        <v-btn icon color="primary">
          <v-icon>print</v-icon>
        </v-btn>
        <v-btn icon disabled>
          <v-icon>print</v-icon>
        </v-btn>
        <v-btn icon disabled color="primary">
          <v-icon>print</v-icon>
        </v-btn>
        <v-btn disabled color="primary">
          <v-icon>print</v-icon>
        </v-btn>
        <v-btn color="primary">
          <v-icon>print</v-icon>
        </v-btn>
      </v-container>
    </v-content>
  </v-app>
</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 feature but make 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)

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[codecov]

Codecov Report

Merging #5734 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #5734   +/-   ##
=======================================
  Coverage   89.02%   89.02%           
=======================================
  Files         262      262           
  Lines        5921     5921           
  Branches     1467     1467           
=======================================
  Hits         5271     5271           
  Misses        533      533           
  Partials      117      117

Impacted Files	Coverage Δ
packages/vuetify/src/components/VBtn/VBtn.ts	82.92% <100%> (ø)	⬆️

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[lock]

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