Follow-up to merge in r1632907: Make tests pass again for FSX.

* subversion/tests/cmdline/svnadmin_tests.py
  (check_hotcopy_fsfs_fsx): Since FSFS no longer uses any revprop caching
                            infrastructure, it is safe to read the generation
                            number unconditonally in the new-style format.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1634950 13f79535-47bb-0310-9956-ffa450edef68