Remove duplicated logic in vanilla example

Author: curran

packages/create-vite/template-vanilla/counter.js

@@ -4,6 +4,6 @@ export function setupCounter(element) {
     counter = count
     element.innerHTML = `count is ${counter}`
   }
-  element.addEventListener('click', () => setCounter(++counter))
+  element.addEventListener('click', () => setCounter(counter + 1))
   setCounter(0)
 }