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

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### 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_

No source file or test is named in the issue. Start by running the supplied Lua reproduction in the VS Code extension and trace completion behavior after entering `{` for the `Options` parameter; done means the `@class` fields are offered automatically without pressing Ctrl+Space.

Written by the indexing model from the issue text.