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Suggested by: @oparoz

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Spotted by: @fabianfrz

(cherry picked from commit ff6f2341)

Wouldn't it be better to do this unconditionally if more CSC
features are pushed and this might be missed again?

PR: https://forum.opnsense.org/index.php?topic=2449.0
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(Yay, it's gone.)

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The new package targets have no drawbacks compared to auto live
mount, but the latter has proven difficult and does not match the
normal boot scenario and could potentially panic due to unionfs
being broken beyond repair (kib@'s words in spirit, not mine).

Discussed with: @adschellevis

(cherry picked from commit 80a70ffe)