WineD3D: upload p8 palette using GL_ALPHA instead of GL_RED

[Roderick Colenbrander]

Hi,

The p8 emulation shader uploads data using GL_RED while the index_in_alpha path (both are always active at the same time) uses GL_ALPHA. This patch makes both paths use GL_ALPHA, this fixes readback problems in Red Alert.

All my other test cases (StarCraft, Jazz JackRabbit 2, DXSDK ddex4/5) all still work.

Regards,
Roderick Colenbrander
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