wined3d: fix check for P8 render target

[Alexander Dorofeyev]

Hi.

I think this part of d3dfmt_p8_init_palette has a bug, because it appears to be
checking that render target is a render target. Incorrectly going into
index_in_alpha codepath here causes this bug:

http://bugs.winehq.org/show_bug.cgi?id=10797

in Aliens vs Predator 1 game - it prefers P8 textures and sets color key on some
textures for transparency and alpha channel is wrong on such textures in game.

---
     dlls/wined3d/surface.c |    7 ++-----
     1 files changed, 2 insertions(+), 5 deletions(-)



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