style(create-vite): use quotes for attributes consistently

As part of my changes in vitejs#12374, I unintentionally removed the quotes
for the Vite logos from the vanilla templates, perhaps because the rest
of the templates didn't need them.

While HTML5 allows no quotes for attribute values if the value doesn't contain
a space, keeping a consistent style is important for cognitive load when
reading and maintaining. Hence, I've marked this as a style change.

While not a functional change in these templates, it could be if someone
later changed the import path to contain a space (perhaps after
generating a project using the template).

packages/create-vite/template-vanilla-ts/src/main.ts

@@ -6,7 +6,7 @@ import { setupCounter } from './counter'
 document.querySelector<HTMLDivElement>('#app')!.innerHTML = `
   <div>
     <a href="https://vitejs.dev" target="_blank">
-      <img src=${viteLogo} class="logo" alt="Vite logo" />
+      <img src="${viteLogo}" class="logo" alt="Vite logo" />
     </a>
     <a href="https://www.typescriptlang.org/" target="_blank">
       <img src="${typescriptLogo}" class="logo vanilla" alt="TypeScript logo" />

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

@@ -6,7 +6,7 @@ import { setupCounter } from './counter.js'
 document.querySelector('#app').innerHTML = `
   <div>
     <a href="https://vitejs.dev" target="_blank">
-      <img src=${viteLogo} class="logo" alt="Vite logo" />
+      <img src="${viteLogo}" class="logo" alt="Vite logo" />
     </a>
     <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript" target="_blank">
       <img src="${javascriptLogo}" class="logo vanilla" alt="JavaScript logo" />