fix(create-vant-cli-app): incorrect compiler-sfc name

packages/create-vant-cli-app/generators/vue3/package.json.tpl

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@vant/cli": "^3.0.0",
-    "@vue/sfc-compiler": "^3.0.0",
+    "@vue/compiler-sfc": "^3.0.0",
     "babel-plugin-import": "^1.13.0",
     "vue": "^3.0.0"
   },

packages/create-vant-cli-app/generators/vue3/src/demo-button/test/index.spec.js

@@ -1,5 +1,5 @@
 import { mount } from '@vue/test-utils';
-import DemoButton from '..';
+import DemoButton from '../../demo-button';
 
 test('render demo button', () => {
   const wrapper = mount(DemoButton);