Anonymous function whitespace

Nadie ha tomado este issue todavía.

### 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_

Reproduce el comportamiento del autocompletado en la extensión de Visual Studio Code en Windows usando `table.sort({}, ` y acepta la plantilla de función anónima sugerida. Sigue el procesamiento del autocompletado para funciones anónimas y regulares, y luego verifica que aceptar la plantilla anónima no inserte el carácter de espacio en blanco adicional.

Escrito por el modelo de indexación a partir del texto del issue.