delta-find: fix pulled-delta-reuse-policy=forced behavior...
delta-find: fix pulled-delta-reuse-policy=forced behavior
The code that select delta still has too many oportunity to discard the delta
is has been forcibly asked to reuse. However is is fairly easy to use a
dedicated fastpath for this case. So we do so.
Cleaning other code that tries to enforce that policy will be done on default.