wined3d: also update alpha test when stage texture is NULL

[Alexander Dorofeyev]

Please do not apply my previous patch

wined3d: dirtify colorkey state in IWineD3DDeviceImpl_SetTexture

This one is a better variation, that puts the fix into a more appropriate
function, thanks to suggestion by Stefan Dösinger.
---
       dlls/wined3d/state.c |    7 +++++++
       1 files changed, 7 insertions(+), 0 deletions(-)





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