fix(slide-toggle): use default hue for thumb in dark theme (#14230)
fix(slide-toggle): use default hue for thumb in dark theme (#14230)

* The thumb should use the `default` hue in dark themes to match the MDC behavior and also make it easier for people to create a custom theme without needing to explicitly specify the `200` hue just for the slide-toggle. This also makes the slide-toggle more consistent with the checkbox and radio (which are considered selection controls as well)

Fixes #14192
Jefiozie/material2,andrewseguin/material2,Jefiozie/material2,josephperrott/material2,josephperrott/material2,jelbourn/material2,angular/components,angular/components,Jefiozie/material2,jelbourn/material2,DevVersion/material2,mmalerba/material2,DevVersion/material2,andrewseguin/material2,angular/components,mmalerba/material2,mmalerba/material2,andrewseguin/material2,josephperrott/material2,crisbeto/material2,DevVersion/material2,jelbourn/material2,Jefiozie/material2,andrewseguin/material2,josephperrott/material2,jelbourn/material2,crisbeto/material2,jelbourn/material2,mmalerba/material2,Jefiozie/material2,DevVersion/material2,crisbeto/material2,crisbeto/material2,josephperrott/material2,andrewseguin/material2,DevVersion/material2,mmalerba/material2,angular/components