Please deploy ikiwiki po plugin fix from ticket #6907

From: https://redmine.tails.boum.org/code/issues/6907

Whilst we don’t have an upstream-blessed or upstream-merged patch (yet) we should patch this for our main site. It’s silly to not have this fixed and humans seeing it, after all.

I believe we can just patch src:ikiwiki and plonk that in our overlay system (even though we don’t ship ikiwiki binaries on the Tails ISO).

Related issues

Related to #6907 (closed)
Blocks #15506 (closed)

Original created by @lamby on 16185 (Redmine)

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