[whatwg/url] Should hostname setter ignore colon (:)? (#601)

The spec currently provides for the following:

```js
u = new URL("http://example.net/path");
u.hostname = "example.com:8080";
console.assert(u.hostname === "example.com");  // FF & WK: "example.net"
console.assert(u.port === "");

u = new URL("http://example.net:8080/path");
u.hostname = "example.com:";
console.assert(u.hostname === "example.com");  // FF & WK: "example.net"
console.assert(u.port === "8080");
```

(The test cases came from [WPT](https://github.com/web-platform-tests/wpt/blob/e75d075b7c27fb29e83ca9f5ab785995fd09736f/url/resources/setters_tests.json#L1155-L1176).)

However, no one actually implements this. Firefox and Safari both reject the given hostname value if it contains a port part, and leave the hostname unchanged.

Shall we align with Firefox and Safari?

<details><summary>(OTOH, Chrome does something that makes no sense, so I'd like to exclude it from the discussion for now.)</summary>

```js
u = new URL("http://example.net/path");
u.hostname = "example.com:8080";
console.log(u.hostname);   // prints ""
console.log(u.href);       // prints "http://example.com:8080/path"
```

</details>

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