Autocompletion is not offered for a parameter with a `@class` type

還沒有人認領這個 Issue。

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Completion

### Expected Behaviour

When using a defined class as the type for a parameter, the fields of that table should be offered as an autocompletion when calling the function.

For an example, using `@alias` works like so:

### Actual Behaviour

No autocompletion is automatically offered when using `@class` as the type for a parameter. If you press CTRL + Space, you can make the completions appear, but they will not appear automatically.

Nothing is offered:
Until I press CTRL + Space:

### Reproduction steps

1. Use the below code:
```lua
---@class Options
---@field page number
---@field active boolean

---@param opts Options
local function acceptOptions(opts) end

acceptOptions()
```
2. Move your cursor to line 9 (`acceptOptions()`) and place it between the parentheses
3. Enter `{` to start a table literal
4. No completions are offered
5. Press CTRL + Space and notice that the first 2 options are actually proper completions from the `Options` class. These should automatically be offered.

### Additional Notes

_No response_

### Log File

_No response_

issue 中沒有指定原始碼檔案或測試。首先在 VS Code 擴充功能中執行提供的 Lua 重現，並追蹤為 `Options` 參數輸入 `{` 後的補全行為；當 `@class` 欄位無需按下 Ctrl+Space 即可自動提供時，即表示完成。

由索引模型根據 Issue 內容生成。