Bug 1652568 - Enable test_worker_xhr_parameters.html for xorigin fission r=kmag

Differential Revision: https://phabricator.services.mozilla.com/D87849

dom/xhr/tests/mochitest.ini

@@ -83,7 +83,6 @@ support-files = window_worker_xhr_3rdparty.html
 [test_worker_xhr_headers.html]
 [test_worker_xhr_implicit_cancel.html]
 [test_worker_xhr_parameters.html]
-fail-if = (xorigin && fission)
 [test_worker_xhr_responseURL.html]
 [test_worker_xhr_system.html]
 [test_worker_xhr_timeout.html]