[PATCH] BUG: 165460 Some icons with "semi transparent" effect (disabled) get checkered pattern

[Christoph Feck]

Hi!

Some icons are stored as 8 bit palettized images (due to PNG optimization), 
and the KIconEffect::semiTransparent() code avoids allocating a new palette, 
but instead injects transparent pixels into the image, causing the effect 
described in the bug report. The patch fixes this.

I am posting it for review here, because I am not really sure, wether changing 
the color table is the right thing, or if there are some cases where the 
palette should not be touched even when the Antialiasing support is 
available.

Thanks,
Christoph Feck (kdepepo)
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