Wrong binding of `fetch_withRequest`

[stephanoskomnenos]

https://github.com/rescript-lang/experimental-rescript-webapi/blob/main/src/Global.res#L496-L509

@send should be removed

[nojaf]

Hello, thanks for reporting this issue!
I believe you are right, this might have happened when refactoring this method on the Window type.
Are you interested in sending a PR for this?