`prog-mode-hook` not called

I have a hook for showing line numbers only when prog-mode is loaded and it's something along the lines of

```
(add-hook 'prog-mode-hook 'display-numbers-hook)
```
This works for all programming modes except vue-mode. Is there any reason `prog-mode-hook` is not called when loading vue-mode?

Start at the vue-mode entry point and trace whether loading the mode invokes `prog-mode-hook`, using the reported `add-hook` example as the reproduction. Done means `prog-mode-hook` is called when vue-mode loads, so the line-number hook behaves as it does in other programming modes.

由索引模型根據 Issue 內容生成。