feat(checkbox): Use new mdc-states mixin for checkbox styles (#1672)

Author: kfranqueiro

demos/checkbox.scss

@@ -26,7 +26,7 @@
   $color: $material-color-red-500;
 
   @include mdc-checkbox-focus-indicator-color($color);
-  @include mdc-ripple-color($color, $mdc-checkbox-ripple-opacity);
+  @include mdc-states($color);
   @include mdc-checkbox-container-colors(
     $unmarked-stroke-color: $color,
     $unmarked-fill-color: rgba($color, .25),

packages/mdc-checkbox/mdc-checkbox.scss

@@ -26,7 +26,7 @@
   @include mdc-checkbox-ink-color($mdc-checkbox-mark-color);
   @include mdc-checkbox-focus-indicator-color($mdc-checkbox-baseline-theme-color);
   @include mdc-ripple-surface;
-  @include mdc-ripple-color($mdc-checkbox-baseline-theme-color, $mdc-checkbox-ripple-opacity);
+  @include mdc-states($mdc-checkbox-baseline-theme-color);
   @include mdc-ripple-radius($mdc-checkbox-ripple-radius);
   @include mdc-checkbox-container-colors();