Revert to checkbox

Author: compulim

packages/component/src/ActivityFeedback/private/ThumbButton.tsx

@@ -76,7 +76,7 @@ function ThumbButton(props: ThumbButtonProps, ref: ForwardedRef<HTMLInputElement
         onChange={handleChange}
         onKeyDown={handleKeyDown}
         ref={ref}
-        type="radio"
+        type="checkbox"
       />
       <ThumbButtonImage
         className={classNames('webchat__thumb-button__image', 'webchat__thumb-button__image--is-stroked', {