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

packages/create-vant-cli-app/generators/vue2/src/demo-button/README.md

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+# DemoButton 按钮
+
+### 介绍
+
+DemoButton 是一个示例按钮组件
+
+### 引入
+
+```js
+import Vue from 'vue';
+import { DemoButton } from '<%= name %>';
+
+Vue.use(DemoButton);
+```
+
+## 代码演示
+
+### 基础用法
+
+```html
+<demo-button type="primary" />
+```
+
+## API
+
+### Props
+
+| 参数          | 说明     | 类型     | 默认值    |
+| ------------- | -------- | -------- | --------- |
+| type          | 按钮类型 | _string_ | `primary` |
+| color `1.0.0` | 按钮颜色 | _string_ | -         |
+
+### Events
+
+| 事件名 | 说明       | 回调参数     |
+| ------ | ---------- | ------------ |
+| click  | 点击时触发 | event: Event |
+
+### Slots
+
+| 名称    | 说明     |
+| ------- | -------- |
+| default | 默认插槽 |

packages/create-vant-cli-app/generators/vue2/src/demo-button/demo/index.vue

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+<template>
+  <demo-section>
+    <demo-block title="基础用法">
+      <demo-button type="primary" style="margin-left: 15px">按钮</demo-button>
+    </demo-block>
+
+    <demo-block title="自定义颜色">
+      <demo-button color="#03a9f4" style="margin-left: 15px">按钮</demo-button>
+    </demo-block>
+  </demo-section>
+</template>

packages/create-vant-cli-app/generators/vue2/src/demo-button/index.vue

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+<template>
+  <button class="demo-button">
+    <slot />
+  </button>
+</template>
+
+<script>
+export default {
+  name: 'demo-button',
+
+  props: {
+    color: String,
+    type: {
+      type: String,
+      default: 'primary',
+    },
+  },
+};
+</script>
+
+<style lang="<%= cssLang %>">
+.demo-button {
+  min-width: 120px;
+  color: #fff;
+  font-size: 16px;
+  line-height: 36px;
+  background-color: #f44;
+  border: none;
+  border-radius: 30px;
+}
+</style>

packages/create-vant-cli-app/generators/vue2/src/demo-button/test/__snapshots__/index.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`render demo button 1`] = `<button class="demo-button"></button>`;

packages/create-vant-cli-app/generators/vue2/src/demo-button/test/index.spec.js

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