Bug 1762462 - Make tests in dom/websocket/tests/ reflect Always Partitioning Storage; r=baku

Depends on D144731

Differential Revision: https://phabricator.services.mozilla.com/D151393

dom/websocket/tests/test_bug1384658.html

@@ -40,6 +40,8 @@ SimpleTest.waitForExplicitFinish();
 SpecialPowers.pushPrefEnv({
   set: [
     ["network.cookie.cookieBehavior", 4],
+    // disable third-party storage isolation so the test works as expected
+    ["privacy.partition.always_partition_third_party_non_cookie_storage", false],
     ["dom.security.https_first", false]
   ],
 }, test_frameset);