fix(VSelect): update selected color

[FAKER-A]

Description

When color is set to a value of type #123456, the selected color will not change.
The purpose of this submission is to fix the above problem.

Motivation and Context

Fixes #6685
https://codepen.io/peterhpchen/pen/RdKzKP?editors=1010

How Has This Been Tested?

none

Markup:

Details

<template>
  <v-app>
    <v-autocomplete v-model="model" color="#FF66FF" :items="items"></v-autocomplete>
    <v-autocomplete v-model="model" color="red" :items="items"></v-autocomplete>
  </v-app>
</template>

<script>
  export default {
    data: () => ({
      model: 1,
      items: Array.from(new Array(60).keys(), (value, index) => index + 1)
    })
  }
</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)

[TravisBuddy]

Hey @FAKER-A,
Your changes look good to me!

View build log

TravisBuddy Request Identifier: 0c640df0-68d4-11e9-a1ab-3f769e34a7d0

[codecov]

Codecov Report

Merging #7079 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #7079   +/-   ##
=======================================
  Coverage   85.43%   85.43%           
=======================================
  Files         298      298           
  Lines        7221     7221           
  Branches     1804     1804           
=======================================
  Hits         6169     6169           
  Misses        956      956           
  Partials       96       96

Impacted Files	Coverage Δ
...ages/vuetify/src/components/VSelect/VSelectList.js	97.18% <ø> (ø)	⬆️
packages/vuetify/src/components/VList/VListTile.ts	100% <100%> (ø)	⬆️

---

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[codecov]

Codecov Report

Merging #7079 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #7079   +/-   ##
=======================================
  Coverage   85.43%   85.43%           
=======================================
  Files         298      298           
  Lines        7221     7221           
  Branches     1804     1804           
=======================================
  Hits         6169     6169           
  Misses        956      956           
  Partials       96       96

Impacted Files	Coverage Δ
...ages/vuetify/src/components/VSelect/VSelectList.js	97.18% <ø> (ø)	⬆️
packages/vuetify/src/components/VList/VListTile.ts	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1fbd20c...4baa042. Read the comment docs.

[nekosaur]

Please fill in the missing sections in PR description

[FAKER-A]

Please fill in the missing sections in PR description

thanks for reminding

My English is not very good, I hope you don't mind.

[dsseng]

@FAKER-A Thank you for your contribution and interest in improving Vuetify! Make sure to join us in the Discord community.