prune: use action "prune", not "touch", in precheck
We have been using "touch" since 06ee4ec88190 (prune: use precheck to
validate revision, 2017-07-23). That commit modified the tests, so it
kind seemed intentional, but I suspect it was still just an oversight.
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Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
Logilab SA <contact@logilab.fr>
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Patrick Mezard <patrick@mezard.eu>
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