Improve regular expression matching order in svnpredumpfilter.py.

* tools/server-side/svnpredumpfilter.py
  (svn_log_stream_get_dependencies): Copies were unnecessarily matched against
   two REs instead of one. Try the copies RE before the general changes RE.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1625693 13f79535-47bb-0310-9956-ffa450edef68