Re: [w3c/DOM-Parsing] Only generate an attribute prefix if required (#30)

Ms2ger left a comment (w3c/DOM-Parsing#30)

This seems to still be buggy, as only _new prefix_ is set, and _candidate prefix_ remains null, so the step below will not serialize any prefix:
```js
  let root = parse('<r></r>');
  root.setAttributeNS('uri', 'p:name', 'value');
  serialize(root) // '<r xmlns:ns1="uri" name="value"/>'
```
(I'm integrating a fix elsewhere, no need to update this PR.)

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