fix(material/slide-toggle): increase slide toggle touch target

[essjay05]

Updates Angular Components Slide Toggle component and increases the touch target to meet strict accessibility guidelines of buttons having a minimum touch target of 48x48 pixels.

Before screenshot Before screencast After screenshot After screencast

Fixes b/265033905

[github-actions[bot]]

Deployed dev-app for 4416dec9ec4bed52b379ded24d76a095c6e9f3d3 to: https://ng-dev-previews-comp--pr-angular-components-31178-dev-ytqsnhym.web.app

Note: As new commits are pushed to this pull request, this link is updated after the preview is rebuilt.

[adolgachev]

Based on further feedback from @crisbeto on https://github.com/angular/components/pull/31469#discussion_r2179314807, I think the preferred solution will actually be https://github.com/angular/components/pull/31486.

[mmalerba]

Closing this since the alternative solution has already been merged

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