oleaut32: Implement setting of the hPal property in IPictureDisp::Invoke.

[Robert Shearman]

Remove some validation code that is already handled by a more generic 
case at the end of the function.
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  dlls/oleaut32/olepicture.c |   21 ++++++++++++++++-----
  1 files changed, 16 insertions(+), 5 deletions(-)
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