wined3d: Improve detection of device palette change.

[Alexander Dorofeyev]

---
  dlls/d3d8/tests/visual.c       |   56 ++++++++++++++++++----------------------
  dlls/wined3d/cubetexture.c     |   13 +++++++++
  dlls/wined3d/device.c          |   18 ++++++++++++-
  dlls/wined3d/surface.c         |   18 +++++++-----
  dlls/wined3d/texture.c         |   11 ++++++++
  dlls/wined3d/wined3d_private.h |    2 +
  6 files changed, 78 insertions(+), 40 deletions(-)
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