Follow-up to r1435746: update svnadmin tests to accept the additional output.

* subversion/tests/cmdline/svnadmin_tests.py
  (verify_windows_paths_in_repos): update expected output string

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1435758 13f79535-47bb-0310-9956-ffa450edef68