Resolve the pool lifetime issue uncovered by committing r1442301.

* subversion/libsvn_wc/wc_db.c
  (read_cached_iprops_baton_t): Remove baton.
  (db_read_cached_iprops): Use standard argument method as a baton is no longer
    needed with the new with transaction macro.
  (svn_wc__db_read_cached_iprops): Update caller.
  (db_read_inherited_props): Pass the right pool to db_read_cached_iprops, as
    we just shallow copy these values later in this function.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1442325 13f79535-47bb-0310-9956-ffa450edef68