gdiplus: Support for indexed formats in GdipBitmapSetPixel (try2)

[MP]

I added support for indexed formats (PixelFormat1bppIndexed,
PixelFormat4bppIndexed, PixelFormat8bppIndexed) to GdipBitmapSetPixel
(because one app needed one these functions).

I fixed a typo that occured doing copy & paste (calling 8bit setpixel also
for 4bit and 1bit images) in 1str version of the patch.

I also removed todo_wine from related tests and verified that patched wine
pass these tests.

Attaching fixed patch to current git origin.

Martin Petricek
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