[Bug Report] v-toolbar CSS overrides v-btn size

[Alex-Mastin]

Environment

Vuetify Version: 2.0.2
Vue Version: 2.6.10
Browsers: Chrome 75.0.3770.100
OS: Linux x86_64

Steps to reproduce

Put a v-btn inside of a v-toolbar and compare it's size when to a v-btn outside of a toolbar

Expected Behavior

v-btn size props should not be overridden by other components

Actual Behavior

If a v-btn is nested inside of a v-toolbar, the v-toolbar's CSS will set the height and width of the v-btn to 48px regardless of if the v-btn has size props applied to it.

Reproduction Link

https://codepen.io/anon/pen/gVgBXx

[jacekkarczmarczyk]

Duplicate of #8035