[whatwg/encoding] gb18030 encoder: unwind from fourth byte when it's not a digit (#111)

Instead of always unwinding if there’s no code point when consuming the
fourth byte, only unwind when the fourth byte is not an ASCII digit.
This does mean that ASCII digits can be masked, but since ASCII digits
are not used as delimiter in any format this is highly unlikely to be
used in any attacks (and also matches existing implementations better).

Fixes #110.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/111

-- Commit Summary --

  * gb18030 encoder: unwind from fourth byte when it's not a digit

-- File Changes --

    M encoding.bs (10)

-- Patch Links --

https://github.com/whatwg/encoding/pull/111.patch
https://github.com/whatwg/encoding/pull/111.diff

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