uxtheme: SetPropW returns a BOOL not an HRESULT.

[Rob Shearman]

Therefore fix the code to handle SetPropW failing with this in mind.

(Found by PreFast.)
---
 dlls/uxtheme/draw.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)
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