[whatwg/fetch] Parsing `application/x-www-form-urlencoded` byte sequence is infallible (Issue #1798)

### What is the issue with the Fetch Standard?

https://fetch.spec.whatwg.org/#dom-body-formdata

In "The formData() method steps":

> "application/x-www-form-urlencoded"
> 1. Let entries be the result of parsing bytes.
> 2. If entries is failure, then throw a TypeError.
> 3. Return a new FormData object whose entry list is entries.

Step 2 seems not necessary because parsing `application/x-www-form-urlencoded` byte sequence is infallible: https://url.spec.whatwg.org/#concept-urlencoded-parser

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