fix(material-experimental/mdc-button): double outline for FAB in high contrast mode (#20391)
fix(material-experimental/mdc-button): double outline for FAB in high contrast mode (#20391)

The MDC-based FAB don't need an extra outline high contrast mode, because they have one already.
crisbeto/material2,DevVersion/material2,andrewseguin/material2,josephperrott/material2,mmalerba/material2,DevVersion/material2,angular/components,crisbeto/material2,josephperrott/material2,andrewseguin/material2,DevVersion/material2,angular/components,mmalerba/material2,josephperrott/material2,mmalerba/material2,crisbeto/material2,angular/components,DevVersion/material2,mmalerba/material2,josephperrott/material2,DevVersion/material2,josephperrott/material2,mmalerba/material2,andrewseguin/material2,andrewseguin/material2,andrewseguin/material2,angular/components,crisbeto/material2