uxtheme: cause themed buttons to render correctly when pressed and released

[Robert Grocott]

(Tried sending this a couple of times previously, but apparently emails are
silently ignored if you're not subscribed to the mailing list? If this ends
up being a duplicate message, sorry about that.)

The attached patch 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.

Robert Grocott
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