DQDefects: Fix ATN test.

ATN test was broken by the insertion of the copyright header, which
screwed up the encoding tag.  Fixed.

DataQuality/DQDefects/python/tests/__init__.py

+# -*- coding: utf-8 -*-
 # Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
 
-# -*- coding: utf-8 -*-
 from os import unlink, environ
 from os.path import exists
 from nose import with_setup