Align with KDFS 1.4.0 rounding update #548
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Updates the codec rounding for sRGB to align with the KDFS 1.4.0 specification update, which reverts the alpha channel endpoint expansion behavior to match an earlier version of the specification.
This changes the alpha channel to use the same method (
(x << 8) | 0x80) as the RGB channels. The previous behavior had alpha doing ((x << 8) | x). The impact of this change is differences in the LSB.Fixes #547