fixup! CMFActivity: take activity age in queue priority

See commit 9ec2259e.

product/CMFActivity/Activity/Queue.py

@@ -260,4 +260,4 @@ class Queue(object):
       Legal value range is [-128, 127].
       Values out of this range might work, but are non-standard.
     """
-    return 128
+    return 128,