Pad IM palette to 768 bytes when saving #6579
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#6060 contained a commit entitled "Allow getpalette() to return less than 256 colors"
This meant that there were fewer bytes when saving in IM.
Pillow/src/PIL/ImImagePlugin.py
Line 355 in 1d1a22b
But IM still expected 768 bytes when reading.
Pillow/src/PIL/ImImagePlugin.py
Line 220 in 1d1a22b
So this PR pads the palette to 768 bytes when saving.