comctl32: toolbar[1/4]: avoid using CopyImage as it doesn't work well when the DDBs are RGB565 (fixes bug #7905)

[Mikołaj Zalewski]

> Since it clearly sounds like a CopyImage bug it would be more appropriate
> to fix CopyImage instead, Microsoft may do that at some point as well.

  I was a bit affraid that even Windows Vista has this bug so there 
might be apps depending on it. However it would be strange for some app 
to depend on it so if you think it's better to patch CopyImage I'll send 
a patch for it.

Mikolaj Zalewski