`decodeAudioData` step 3 has the test inverted

[bakkot]

decodeAudioData step 3/4 says:

1. If audioData is detached, execute the following steps:
   1. Append promise to [[pending promises]].
   2. Detach the audioData ArrayBuffer. If this operations throws, jump to the step 3.
   3. Queue a decoding operation to be performed on another thread.
2. Else, execute the following error steps:
   1. Let error be a DataCloneError.
   2. Reject promise with error, and remove it from [[pending promises]].
   3. Queue a media element task to invoke errorCallback with error.

That's backwards. The first case is for buffers which are not detached. This appears to have gotten broken in #2603; previously it said "If IsDetachedBuffer on audioData is false".

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Also, the "jump to the step 3" part is incoherent.