wined3d: Use the render target its palette when performing a texture copy as the texture doesn't hold one.

Apparently nvidia cards do not like 3.0 vshader + fixed function fragment
processing, so accept their result. This has no implementation implications
for Wine because we need the code to support the 3.0+ffp combination to
handle 3.0+1.x and 3.0+2.0 shader combinations too

This sends EC_COMPLETE notifications to the application after a graph has
finished running for the second time.