fix(vautocomplete): change onClick to not reopen menu

[webstp]

Description

Change VAutocomplete's onClick event to check if the even came from the appendInner icon, this is because onMouseUp will toggle the menu for this event, so onClick would reopen the menu.

Motivation and Context

fix #6564

How Has This Been Tested?

Markup:

<template>
  <v-autocomplete  :items="states"></v-autocomplete>
</template>

<script>
export default {
  data () {
    return {
      states: [
          'Alabama', 'Alaska', 'American Samoa', 'Arizona',
          'Arkansas', 'California', 'Colorado', 'Connecticut',
          'Delaware', 'District of Columbia', 'Federated States of Micronesia',
          'Florida', 'Georgia', 'Guam', 'Hawaii', 'Idaho',
          'Illinois', 'Indiana', 'Iowa', 'Kansas', 'Kentucky',
          'Louisiana', 'Maine', 'Marshall Islands', 'Maryland',
          'Massachusetts', 'Michigan', 'Minnesota', 'Mississippi',
          'Missouri', 'Montana', 'Nebraska', 'Nevada',
          'New Hampshire', 'New Jersey', 'New Mexico', 'New York',
          'North Carolina', 'North Dakota', 'Northern Mariana Islands', 'Ohio',
          'Oklahoma', 'Oregon', 'Palau', 'Pennsylvania', 'Puerto Rico',
          'Rhode Island', 'South Carolina', 'South Dakota', 'Tennessee',
          'Texas', 'Utah', 'Vermont', 'Virgin Island', 'Virginia',
          'Washington', 'West Virginia', 'Wisconsin', 'Wyoming',
        ]
    }
  }
}
</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 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)

[johnleider]

This was merged in #9476

[webstp]

#9476 fixed the issue in VSelect, the issue still exists in VAutocomplete due to it defining its own onClick

[webstp]

Could we please reopen this PR as this solves a different problem than #9476. #9476 fixes the issue in VSelect while this PR fixes Autocomplete