fix(material-experimental/mdc-button): fix ripple size after MDC changes

[mmalerba]

Project import generated by Copybara.

CARETAKER NOTE: This should be merged once cl/386915262 is submitted

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[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

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[allan-chen]

This should be submittable now.

[andrewseguin]

Thanks for the update Allan - will merge shortly

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