[whatwg/dom] isEqualNode and <template> (#737)

```js
const div1 = document.createElement('div');
const div2 = document.createElement('div');
div1.innerHTML = '<template>Hello</template>';
div2.innerHTML = '<template>World</template>';

console.log(div1.isEqualNode(div2));
```

The above logs `true` because `isEqualNode` doesn't check the contents of template. Should it?

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