charts: add overlay labels to all "topN" rows

This doesn't work entirely right in vwm because the overlays are
inappropriately conditional there, with these additions they can't
really be skipped.

What's more likely to happen than fixing this is for vwm to provide a
different charts layout than vmon uses.  I don't want to incur the cost
of rendering this overlay constantly in my vwm instances, so I'm leaving
it half working for the vwm case.

None of this matters to vmon because vmon presently always uses
deferred rendering.

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