Set blue channel to 128 for BC5S #7413
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Resolves #7386
As per https://learn.microsoft.com/en-us/windows/win32/direct3d10/d3d10-graphics-programming-guide-resources-block-compression#bc5, the BC5 (both signed and unsigned) formats only store red and green values. Currently, Pillow takes this to mean that the blue channel is set to zero.
However, the user in the issue has found that texconv, a Microsoft tool, presumes that for BC5S (signed BC5) the blue channel is always 128.