New XFAIL test for issue 4302, move and move back.

* subversion/tests/libsvn_wc/op-depth-test.c
  (move_back): New test.
  (test_funcs): Add new test as XFAIL.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1451217 13f79535-47bb-0310-9956-ffa450edef68