[whatwg/webidl] Fix inverted detached buffer check in ArrayBuffer transfer (PR #1630)

The polarity was flipped in #1420, which turned `Assert: IsDetachedBuffer(jsArrayBuffer) is false.` into a conditional throw but kept `is false`.

That the intent is to throw when detached is confirmed by the note below the algorithm, which lists "is already detached" as a throwing condition. Step 5's `? DetachArrayBuffer` cannot produce that error, as detaching an already-detached buffer is a no-op.

Fixes #1619.


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  https://github.com/whatwg/webidl/pull/1630

-- Commit Summary --

  * Fix inverted detached buffer check in ArrayBuffer transfer

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1630.patch
https://github.com/whatwg/webidl/pull/1630.diff

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