fix: missing output pixel data for read/edit/write on uncompressed pixel data

[wayfarer3130]

dcmjs 0.45.0 introduced a bug where the pixel data was deleted when reading uncompressed images.

Fixes: [#458]

Testing: Read uncompressed pixel data using dcmjs and check that the pixel data value contains one array buffer per frame (item if split items)

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[wayfarer3130]

This ended up not fixing things. Working on a revert + completely different change.