Update header window in listview WM_PAINT handler

[Felix Nawothnig]

This fixes all of the header flickering in #7344 (some flickering in the 
listview itself remains). I believe I've also seen this in other apps 
(eMule comes to my mind).

Problem occurs when the whole window is invalidated with fErase=1 (in my 
case our LVM_SETITEMCOUNT handler does that) - the header is cleared 
with white and the listview WM_PAINT takes a while to complete. During 
that time the header stays white. We could fix this in our 
LVM_SETITEMCOUNT handler but actually native also invalidates the whole 
window and relies on the UpdateWindow(hdr) on WM_PAINT...

---
  dlls/comctl32/listview.c |    3 +++
  1 files changed, 3 insertions(+), 0 deletions(-)
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