Follow-up to r1597989: Remove unused and not released error codes.

* subversion/include/svn_error_codes.h
  (SVN_ERR_FS_AMBIGUOUS_MOVE, SVN_ERR_FS_INCOMPLETE_MOVE): Remove.
  (SVN_ERR_FS_LOCK_OPERATION_FAILED, SVN_ERR_FS_UNSUPPORTED_TYPE): 
   Renumber.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1601667 13f79535-47bb-0310-9956-ffa450edef68