[whatwg/streams] [Demos] Update TextDecoderStream polyfill (#972)

Update to final TextDecoderStream by replacing uses of the TextDecoder
constructor with TextDecoderStream. Update to the later version of the
TextDecoderStream polyfill.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/972

-- Commit Summary --

  * [Demos] Update TextDecoderStream polyfill

-- File Changes --

    M demos/append-child.html (2)
    M demos/streaming-element-backpressure.html (2)
    M demos/streaming-element.html (2)
    M demos/transforms/text-encode-transform.js (179)

-- Patch Links --

https://github.com/whatwg/streams/pull/972.patch
https://github.com/whatwg/streams/pull/972.diff

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