refactor(checkbox): targetting checkbox through instead of new class

Author: ShaneK

core/src/components/checkbox/checkbox.scss

@@ -106,7 +106,7 @@
   * The native control it must be hidden with display:none instead of aria-hidden="true"
   * to avoid nested interactive elements accessibility issues
  */
-.checkbox-native-control {
+ input {
   display: none;
 }
 

core/src/components/checkbox/checkbox.tsx

@@ -298,7 +298,6 @@ export class Checkbox implements ComponentInterface {
           */}
           <input
             type="checkbox"
-            class="checkbox-native-control"
             checked={checked ? true : undefined}
             disabled={disabled}
             id={inputId}