[Bug Report][2.5.4] v-btn-toggle dense property broken

[nbelakovski]

Environment

Vuetify Version: 2.5.4
Vue Version: 2.6.13
Browsers: Chrome 91.0.4472.106
OS: Linux x86_64

Steps to reproduce

Comment out the CSS and you'll notice that the lower group of buttons takes up more space despite have the "dense" attribute

Expected Behavior

The buttons should take up less width and less height

Actual Behavior

The height remains the same, but the width increases.

Reproduction Link

https://codepen.io/nbelakovski/pen/zYZbmMp

Other comments

I'm actually not sure about the vuetify/vue versions, but I figure since it's reproducible in codepen those don't matter as much.