fix(material/slide-toggle): align colors with spec (#25792)
fix(material/slide-toggle): align colors with spec (#25792)

* fix(material/slide-toggle): align colors with spec

Note: the disabled state still isn't 100% right. There seems to be some
opacity interaction going on that prevents matching the spec perfectly.

* fixup! fix(material/slide-toggle): align colors with spec
angular/components,angular/components,crisbeto/material2,angular/components,crisbeto/material2,crisbeto/material2,angular/components,crisbeto/material2