fix(VTabs): margins in RTL mode

[jacekkarczmarczyk]

Description

Regression from #6932 + other RTL fixes

How Has This Been Tested?

visually

Markup:

<template>
  <div>
    <v-switch v-model=$vuetify.rtl label=rtl />

    <v-tabs>
      <v-tab v-for="i in 5" :key="i">Item {{ i }}</v-tab>
    </v-tabs>

    <v-tabs>
      <v-tab v-for="i in 5" :key="i" href="#">Item {{ i }}</v-tab>
    </v-tabs>

    <v-tabs align-with-title>
      <v-tab v-for="i in 50" :key="i">Item {{ i }}</v-tab>
    </v-tabs>

    <v-tabs align-with-title>
      <v-tab v-for="i in 50" :key="i" href="#">Item {{ i }}</v-tab>
    </v-tabs>
  </div>
</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)

[codecov]

Codecov Report

Merging #8123 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8123      +/-   ##
==========================================
+ Coverage   85.76%   85.79%   +0.03%     
==========================================
  Files         334      334              
  Lines        9096     9095       -1     
  Branches     2420     2418       -2     
==========================================
+ Hits         7801     7803       +2     
+ Misses       1207     1204       -3     
  Partials       88       88

Impacted Files	Coverage Δ
packages/vuetify/src/services/theme/index.ts	100% <0%> (ø)	⬆️
.../vuetify/src/components/VSlideGroup/VSlideGroup.ts	84.37% <0%> (+2.55%)	⬆️

---

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