Rest parameters transform doesn't create a variable when used with object shorthand

[Playground](https://typescripttolua.github.io/play.html#src=function%20foo(...args%3A%20any%5B%5D)%20%7B%0A%20%20%20%20return%20%7B%20args%20%7D%3B%0A%7D%0A%0Afunction%20bar(...args%3A%20any%5B%5D)%20%7B%0A%20%20%20%20return%20%7B%20args%3A%20args%20%7D%3B%0A%7D)