Removes unnecessary outline for circle pagination buttons.

[iliyaZelenko]

This will remove the unnecessary border:

For rectangular buttons, this does not interfere, but I think it is not necessary for circle ones.

[jacekkarczmarczyk]

@iliyaZelenko please use the PR template in description, don't forget to include the Playground.vue for testing

[dsseng]

Looks good!

[dsseng]

@iliyaZelenko please use commitizen for good commit names

[codecov]

Codecov Report

Merging #6513 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6513      +/-   ##
==========================================
- Coverage   85.59%   85.59%   -0.01%     
==========================================
  Files         298      298              
  Lines        7165     7162       -3     
  Branches     1781     1781              
==========================================
- Hits         6133     6130       -3     
  Misses        942      942              
  Partials       90       90

Impacted Files	Coverage Δ
...ages/vuetify/src/components/VCarousel/VCarousel.ts	91.66% <0%> (-0.4%)	⬇️

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[dsseng]

@jacekkarczmarczyk said that there won't be any indication of active button when navigating with keyboard, reverting. @iliyaZelenko sorry

[iliyaZelenko]

@jacekkarczmarczyk @sh7dm In this case, we could use the pseudo-class :focus. We can remove the outline, but for the focus to make a beautiful round border.

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