inhibit: update test with new behavior from core
The recent changes in core (to make sure that all bookmarks write are done at
the end of a transaction) changed the behavior of inhibit. When one rebases
a set of hidden revs somewhere, the hidden revs become visible at the end of
the rebase. Both the previous behavior and new behavior seems acceptable but
the tests have to be changed subsequently. This patch modifies one of the test
for inhibit when the case mentioned above happens. We prune the revs inhibited
by the rebase to make the change minimal.