scrolled window: Avoid a crash
gtk_scrolled_window_allocate_scrollbar was calling gtk_scrolled_window_allocate_child just to get the relative allocation, overlooking the fact that that function is only safe to call if the scrolled window _has_ a child. Unfortunately, gtk_scrolled_window_allocate_scrollbar will sometimes get called when that is not the case. Since we are really only interested in the relative allocation, just get that directly. This fixes a segfault in the style-properties-nth-child reftest.
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