server: Update the top clipping window's surface region if the window pixel format was cleared, too.

[Ken Thomases]

On rare occasions, a window's pixel format can be cleared.  (For example, when
dlls/winex11.drv/opengl.c:set_gl_drawable_parent() fails to recreate the drawable.)
In the future, this will become a lot less rare with the WGL_WINE_surface extension.

When such a window is also its own top clipping window and never had any descendants
with pixel formats, the previous logic was failing to indicate that its surface
needed to be updated.  That resulted in the window failing to render.
---
server/window.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

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