mediawiki.test.js: Suppress false postives for deprecated mw.* properties

mediawiki.test.js: Suppress false postives for deprecated mw.* properties

[qunit]
  mediawiki.jscompat...OK
  mediawiki - Initial check...
   Use of "anonymous" is deprecated. Use mw.user.isAnon instead.
   Use of "name" is deprecated. Use mw.user.getName instead.
   Use of "jsMessage" is deprecated. Use mw.notify instead.
   Use of "wikiGetlink" is deprecated. Use mw.util.getUrl instead.
  OK
  mediawiki - mw.Map...OK
  mediawiki - mw.config...OK
  mediawiki - mw.msg...OK
  mediawiki - mw.loader...OK

Change-Id: I4a79bc64cc26c1237fefe1503504cde9d40a5087