Fix a nested move XFAIL.

* subversion/libsvn_wc/wc_db.c
  (delete_node): Tweak op-depth calculation. 

* subversion/libsvn_wc/wc-queries.sql
  (STMT_SELECT_MOVED_PAIR): Tweak comment.

* subversion/tests/libsvn_wc/op-depth-test.c
  (nested_move2): Remove comments.
  (test_funcs): Mark nested_move2 PASS.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1435273 13f79535-47bb-0310-9956-ffa450edef68