Bug 1232118 - Fix use of stash.put in CORS test, r=Ms2ger

testing/web-platform/meta/cors/redirect-preflight-2.htm.ini

@@ -1,5 +0,0 @@
-[redirect-preflight-2.htm]
-  type: testharness
-  [Same-origin custom-header request, redirect to cross-origin succeeds after doing a preflight]
-    expected: FAIL
-

testing/web-platform/tests/cors/resources/cors-makeheader.py

@@ -36,7 +36,7 @@ def main(request, response):
 
         #Log that the preflight actually happened if we have an ident
         if 'token' in request.GET:
-            request.server.stash.put(request.GET['token'])
+            request.server.stash.put(request.GET['token'], True)
 
     if 'location' in request.GET:
         if code is None: