Remove a flag from a libsvn_wc private api, that normally shouldn't be used.

This fixes a bug in the few cases that did use the flag unintended. The hidden
behavior is tied to how we did things in the svn_wc_entry_t world of <= 1.6.

* subversion/include/private/svn_wc_private.h
  (svn_wc__node_get_base): Remove show_hidden flag.

* subversion/libsvn_client/commit_util.c
  (harvest_status_callback): Update caller.

* subversion/libsvn_client/externals.c
  (switch_dir_external): Update caller that asked for hidden, but only looked
    at working copy roots, which can't be hidden.

* subversion/libsvn_client/locking_commands.c
  (organize_lock_targets): Update caller.

* subversion/libsvn_client/merge.c
  (calculate_remaining_ranges): Update caller.

* subversion/libsvn_client/mergeinfo.c
  (svn_client__get_wc_mergeinfo): Update caller.

* subversion/libsvn_client/update.c
  (update_internal): Update caller.

* subversion/libsvn_client/util.c
  (svn_client__wc_node_get_base): Update caller.

* subversion/libsvn_wc/node.c
  (svn_wc__node_get_base): Simplify implementation.

* subversion/tests/libsvn_wc/wc-test.c
  (test_node_get_base): Update caller.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1640801 13f79535-47bb-0310-9956-ffa450edef68