[3.13] gh-101828: Fix `jisx0213` codecs removing null characters (gh-139340) (gh-140112)

* [3.13] gh-101828: Fix `jisx0213` codecs removing null characters (gh-139340)
(cherry picked from commit 87eadce3e0309d80a95e85d70a00028b5dca9907)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>

* Accidentally removed line