fix(checkbox): Update to match new colors (#2622)

Author: williamernest

packages/mdc-checkbox/_variables.scss

@@ -14,10 +14,12 @@
 // limitations under the License.
 //
 
-$mdc-checkbox-mark-color: white !default;
-$mdc-checkbox-border-color: rgba(black, .54) !default;
-$mdc-checkbox-disabled-color: rgba(black, .26) !default;
-$mdc-checkbox-baseline-theme-color: secondary !default;
+@import "@material/theme/variables";
+
+$mdc-checkbox-mark-color: mdc-theme-prop-value(on-primary);
+$mdc-checkbox-border-color: rgba(mdc-theme-prop-value(on-surface), .54);
+$mdc-checkbox-disabled-color: rgba(mdc-theme-prop-value(on-surface), .26);
+$mdc-checkbox-baseline-theme-color: secondary;
 
 $mdc-checkbox-touch-area: 40px;
 $mdc-checkbox-size: 18px;

packages/mdc-checkbox/package.json

@@ -17,8 +17,8 @@
     "@material/animation": "^0.34.0",
     "@material/base": "^0.34.0",
     "@material/ripple": "^0.34.1",
-    "@material/selection-control": "^0.34.1",
     "@material/rtl": "^0.34.0",
+    "@material/selection-control": "^0.34.1",
     "@material/theme": "^0.34.0"
   }
 }