[NL] "ranking-across-vars' does not get inherited through context

[jehangiramjad]

From https://github.com/datacommonsorg/website/pull/2920#pullrequestreview-1525667265:

In go/dcnl-ct-demo, with medium_ft, the [How does that compare with russia?] page has many more charts (https://screenshot.googleplex.com/9DqPsPxG9ZasUMt) than the [top sources of co2 emissions in USA] page. That's because the "ranking-across-vars" doesn't get inherited thru context. We can improve on the fullfillment side.