[whatwg/dom] Fix Web IDL extended attribute usage for recent changes (#446)

In https://github.com/heycam/webidl/pull/286 we updated Web IDL so that
the extended attribute [TreatNullAs] now apply to types, not attributes.
This updates the spec's usage of [TreatNullAs] to conform to this.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/446

-- Commit Summary --

  * Fix Web IDL extended attribute usage for recent changes

-- File Changes --

    M dom.bs (2)

-- Patch Links --

https://github.com/whatwg/dom/pull/446.patch
https://github.com/whatwg/dom/pull/446.diff

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