comctl32: Get the background colour in ANIMATE_PaintFrame, instead of just in WM_PAINT.

[Robert Shearman]

This fixes the rendering of transparent animations when using a 
background thread.
---
  dlls/comctl32/animate.c |    8 +++-----
  1 files changed, 3 insertions(+), 5 deletions(-)

This is also alluded to in a blog post by Raymond Chen, citing why a 
background thread is pretty useless:
http://blogs.msdn.com/oldnewthing/archive/2006/03/16/552821.aspx
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