chore: default to non-class components for Vue 3 TS projects (#5755)

Author: haoqunjiang

packages/@vue/cli/lib/promptModules/typescript.js

@@ -15,7 +15,7 @@ module.exports = cli => {
     message: 'Use class-style component syntax?',
     description: 'Use the @Component decorator on classes.',
     link: 'https://vuejs.org/v2/guide/typescript.html#Class-Style-Vue-Components',
-    default: true
+    default: answers => answers.vueVersion !== '3'
   })
 
   cli.injectPrompt({