uxtheme: cause themed buttons to redraw themselves correctly.

[Robert Grocott]

This fixes an unreported bug: themed button controls will redraw themselves
in the unthemed style on mousedown and mouseup (as well as a few other,
rarer events). This was due to various button message handlers invoking the
unthemed renderer directly, rather than deferring to WM_PAINT. Patch is
attached.
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