fix(material-experimental/mdc-checkbox): fix broken dark theme

[mmalerba]

This is a re-submit of #20926 with a fix for the focus state

[wagnermaciel]

lgtm

[crisbeto]

What is broken in the current dark theme styles? It seemed to work for me in the dev app.

[wagnermaciel]

What is broken in the current dark theme styles? It seemed to work for me in the dev app.

We had a screenshot failure from the previous change where the focus state of a checkbox was not the correct color (I think it was darker than it was supposed to be). I'm not super familiar with mdc-checkbox so I don't fully understand why, but the changes in this PR have fixed the issue. I'm working on getting it submitted as quickly as possible

[mmalerba]

I forgot to include the styles to re-color the ripple for primary, accent, warn states - so the ripple was always gray. Fixed it in this PR

[crisbeto]

@wagnermaciel I meant to ask what issue was the original PR fixing, before we had to revert it?

[wagnermaciel]

@crisbeto I'm not sure. @mmalerba might have the answer you're looking for

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