bug 1273201 - Also also disable 018.html. r=frequent-intermittent

testing/web-platform/meta/websockets/interfaces/WebSocket/events/018.html.ini

@@ -1,12 +1,7 @@
-[018.html?wss]
-  type: testharness
-  expected: TIMEOUT
-  [open event]
-    expected: TIMEOUT
-
-  [message event]
-    expected: TIMEOUT
-
-
 [018.html]
   type: testharness
+  disabled: https://bugzilla.mozilla.org/show_bug.cgi?id=1273201
+
+[018.html?wss]
+  type: testharness
+  disabled: https://bugzilla.mozilla.org/show_bug.cgi?id=1273201