vcr: alternate row backgrounds in headless snapshots

Eventually this should get applied semi consistently to all
snapshots, but I'm most annoyed by its omission from the
--headless PNGs at the moment.

Also it arguably makes sense to always start with extending the
constrained mem-to-png case where we're working with a 256-color
palette, since the Xlib/XRender case has effectively no
constraints.  Or just abandon any hope of preserving consistency
across the rendered output modes..

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