Spotted on feature/buster that's the first branch that exercises
this code, but there's no reason to fix it only there.

… just like Cody did in commit b330461a.

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This reverts commit 95a40425.

We've closed that ticket precisely because we have documented
this problem on the Known Issues page. But there's no indication
that the documented workaround is not needed anymore.

Closes: #14250
Refs: #15168

Document pinentry focus stealing issue and the corresponding GnuPG persistence upgrade manual step (Closes: #15156)

This should have been documented in the release notes when we released Tails
2.3, but we forgot.

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This reverts commit c3f0521b.

Instead, point to a complete list of candidates for the documented worarounds.

And then I'll start a new list of adapters for which the documented workarounds
don't work.

Known issues: add a dedicated section about NVIDIA Pascal and a link to the complete list of NVIDIA Maxwell cards (refs: #15116).