completion doesn't work in some SFC files and template section

[zjlovezj]

• [x] I have searched through existing issues
• [x] I have read through docs
• [x] I have read FAQ
• [x] I have tried restarting VS Code or running Vetur: Restart VLS

Info

• Platform: macOS
• Vetur version: 0.31.3
• VS Code version: 1.52.1

Problem

VS Code logs

```javascript Vetur initialized [INFO ] Find node_modules paths in {stripped}/vue-starter - 730ms [INFO ] Loaded bundled typescript@4.1.2. [INFO ] Loaded bundled prettier. [INFO ] Loaded bundled @starptech/prettyhtml. [INFO ] Loaded bundled prettier-eslint. [INFO ] Loaded bundled prettier-tslint. [INFO ] Loaded bundled stylus-supremacy. [INFO ] Loaded bundled @prettier/plugin-pug. ```

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