chore(demo): remove text from ripple demo (#1298)

It shows up as "false false" in the app with no indication to the user of what that means

Author: MatrixFrog

src/demo-app/ripple/ripple-demo.html

@@ -49,5 +49,4 @@
       Click me
     </div>
   </section>
-  {{centered}} {{rounded}}
 </div>