ddraw: Don't allow SetPalette on mipmap sublevels instead of root surfaces.

[Ričardas Barkauskas]

Should help 28157, 28217, 28227. Though 28157 seems to be also suffering 
from another regression, which causes crash before reaching bug caused 
by SetPalette.
---
  dlls/ddraw/surface.c        |    2 +-
  dlls/ddraw/tests/d3d.c      |    3 +
  dlls/ddraw/tests/dsurface.c |  101 
+++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 105 insertions(+), 1 deletions(-)


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