Xfailing test_edit_profile_has_proper_display_name

https://bugzilla.mozilla.org/show_bug.cgi?id=897906
And test is failing on CI: http://qa-selenium.mv.mozilla.com:8080/job/affiliates.trunk/5056/testReport/tests.test_home_page/TestHomePage/test_edit_profile_has_proper_display_name/