[whatwg/encoding] Editorial: Fix instances of prepend used with an end-of-queue item (#266)

At various times in the ISO-2022-JP decoder and encoder, the prepend operation was being called with an end-of-queue item, even though that was made illegal in #215. This change removes those instances, in order to keep the same behavior as before #215.

This was discovered in #263.


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  https://github.com/whatwg/encoding/pull/266

-- Commit Summary --

  * Editorial: Fix instances of prepend used with an end-of-queue item

-- File Changes --

    M encoding.bs (16)

-- Patch Links --

https://github.com/whatwg/encoding/pull/266.patch
https://github.com/whatwg/encoding/pull/266.diff

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