convert/bzr: fix test of divergent nested renames for bzr 1.x
54c0517c0fe8 introduced a new block in test-convert-bzr-directories.t
which produces a slightly different output with older bzr versions.
Tested with bzr 1.5 on Debian lenny.
$ hg init t
$ cd t
$ echo a > a
$ hg add a
$ hg commit -m test
$ rm .hg/requires
$ hg tip
abort: index 00changelog.i unknown format 2!
[255]
$ echo indoor-pool > .hg/requires
$ hg tip
abort: unknown repository format: requires features 'indoor-pool' (upgrade Mercurial)!
[255]
$ echo outdoor-pool >> .hg/requires
$ hg tip
abort: unknown repository format: requires features 'indoor-pool', 'outdoor-pool' (upgrade Mercurial)!
[255]