bug: node cleaner for function bodies (cont. #209)

[scr2em]

This is the continuation of our previous conversation in #211

@morgante I believe it's a valid javascript, can you recheck ?

const x = () => (log(), log());

Honestly tho, I don't think Grit should handle that, but just throwing this case here.

Here is another example that looks like a domino effect, If we are trying to remove a default value of a destructed property

My initial thoughts

1. we may decide to remove the parameter since we can't put any other value.
2. then you will have to check if it's the only parameter to remove `{}` 
3. then you will have to remove the entire line if that's the case. 

but I guess we can just just remove the assign operator

[scr2em]

more examples https://app.grit.io/studio?key=jymCvYCQhupCZUL-PWIrH&preset=no_alert