Fix a test failure on win32.
Fix a test failure on win32.

* subversion/tests/clients/cmdline/lock_tests.py
  (lock_unlock): Use paths with explict '/' separators when tweaking.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion