Bug 1490546 - update disabling condition r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D36712

--HG--
extra : moz-landing-system : lando

testing/web-platform/meta/service-workers/service-worker/postmessage.https.html.ini

@@ -1,7 +1,7 @@
 [postmessage.https.html]
   disabled:
     if (os == "android") and not e10s: https://bugzilla.mozilla.org/show_bug.cgi?id=1499972
-    if (os == "android") and debug: https://bugzilla.mozilla.org/show_bug.cgi?id=1490546
+    if (os == "android") and e10s: https://bugzilla.mozilla.org/show_bug.cgi?id=1490546
 
   [postMessage to a redundant worker]
     expected: FAIL