screen: that a policy was held kept across a swap of the document

Review 4, F12: `Screening::of` started screening over when the document was swapped (a
drop, a switch, a rejoin), the root pin alone carried on, so whether the document had
held a policy (`policed`, 1211) was forgotten there too, not only across a restart as
documented: after a drop with the policy removed meanwhile, late changes written under
it went in unjudged again.

It is carried on now, as the root pin is; what belongs to the old document (changes
waiting, refusals, drops held) still starts over. access.md says so.

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