Anonymous function whitespace

还没有人认领这个 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

Not adding a whitespace character if a function is anonymous and therefore can't have a name.

### Actual Behaviour

Adds a whitespace character like if I were create a regular function, which I can name.

### Reproduction steps

1. Type `table.sort({}, `.
2. Once it suggests to autocomplete the template function, press Enter.

### Additional Notes

I think it's a bug because I've never seen anyone code like that. I couldn't find anything related to this in the settings nor in the documentation.

### Log File

_No response_

在 Windows 上的 Visual Studio Code 扩展中使用 `table.sort({}, ` 重现补全行为，并接受建议的匿名函数模板。跟踪匿名函数与普通函数的补全处理，然后验证接受匿名模板不会插入额外的空白字符。

由索引模型根据 Issue 内容生成。