[whatwg/url] Remove "optional" for the init in URLSearchParams constructor? (#424)

As the algorithm of constructor has been updated to make URLSearchParams constructor always have an init parameter at #334, should we also update the `WebIDL` of it to not have `optional`?

```diff
- [Constructor(optional (sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = ""),
+ [Constructor((sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = ""), 
```

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