ddraw: Fix refcounting of palettes

[bobbyg at gmx.net]

This fixes a crash in a game called "Autobahnverfolgungsjagd Total"
(not in AppDB).

While tracing this bug I noticed that
IWineD3DBaseSurfaceImpl_GetPalette() does not call AddRef when
returning the palette. Is that intentional?

Cheers,
Cihan
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