Resolve a FIXME comment in wc-queries.sql.

* subversion/libsvn_wc/wc-queries.sql
  (STMT_CLEAR_MOVED_TO_RELPATH): Require an op-depth parameter to avoid
   clearing the moved-to-relpath of an unrelated node in a multi-layer
   move scenario.

* subversion/libsvn_wc/wc_db.c
  (clear_moved_to, delete_node): Pass the op-depth corresponding to the
   relpath for which the moved-to column is being cleared.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1428798 13f79535-47bb-0310-9956-ffa450edef68