Following up on r1444256, use the diff processor in a few more
cases of the repos-wc diff editor.

* subversion/libsvn_wc/diff_editor.c
  (report_wc_file_as_added,
   close_file): Call the new api to simplify code.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1444264 13f79535-47bb-0310-9956-ffa450edef68