dirauth: The "my-consensus-*" file is not in the sandbox allowlist

From IRC and our resident rodent @weasel:

14:55 <+weasel> Aug 18 18:55:01.000 [warn] sandbox_intern_string(): Bug: No interned sandbox parameter found for /var/lib/tor/my-consensus-microdesc.tmp (on Tor 0.4.7.10 )
14:55 <+weasel> Aug 18 18:55:01.000 [warn] Couldn't open "/var/lib/tor/my-consensus-microdesc.tmp" (/var/lib/tor/my-consensus-microdesc) for writing: Operation not permitted

Considering those are just for dirauth we can stick with 047 and not backport further down.

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